Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

The remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-68549 advisory.

    [140.15.0-1.0.1]
    - Fix firefox-oracle-default-prefs.js for new nss [Orabug: 37079789]
    - diable wasi_sdk to prevent build failure with newer llvm

    [140.15.0]
    - Add debranding patches (Mustafa Gezen)
    - Add OpenELA default preferences (Louis Abel)

    [140.15.0-1]
    - Update to 140.15.0 ESR

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-671330 advisory.

    [140.15.0-1.0.1]
    - Fix firefox-oracle-default-prefs.js for new nss [Orabug: 37079773]
    - Add firefox-oracle-default-prefs.js and remove the corresponding Red Hat file

    [140.15.0]
    - Add debranding patches (Mustafa Gezen)
    - Add OpenELA default preferences (Louis Abel)

    [140.15.0-1]
    - Update to 140.15.0 ESR

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-671290 advisory.

    [140.15.0-1.0.1]
    - Fix firefox-oracle-default-prefs.js for new nss [Orabug: 37079773]
    - Add firefox-oracle-default-prefs.js and remove the corresponding Red Hat file

    [140.15.0-1]
    - Update to 140.15.0 ESR
    - Fix ML-DSA certificate validation       Resolves: RHEL-252227

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0982 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-84145:
    Internally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR     115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we     presume that with enough effort some of these could have been exploited. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

    CVE-2026-84143:
    Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs     showed evidence of memory corruption or another security-relevant defect and we presume that with enough     effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR     140.15, and Firefox ESR 153.2.

    CVE-2026-84131:
    Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

    CVE-2026-84124:
    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR     140.15, and Firefox ESR 153.2.

    CVE-2026-84121:
    Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

    CVE-2026-84120:
    Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

    CVE-2026-84119:
    Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

    CVE-2026-74990:
    Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox     153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we     presume that with enough effort some of these could have been exploited. This vulnerability was fixed in     Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74987:
    Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs     showed evidence of memory corruption or another security-relevant defect and we presume that with enough     effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, and Firefox ESR 153.1.

    CVE-2026-74983:
    Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74976:
    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74974:
    Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox     154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74973:
    Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74972:
    Information disclosure in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74971:
    Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in     Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74969:
    Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74967:
    Same-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74963:
    Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox     154, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74962:
    Site isolation issue in the Networking: Cookies component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74960:
    Site isolation issue in the WebExtensions component. This vulnerability was fixed in Firefox 154, Firefox     ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74959:
    Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74957:
    Mitigation bypass in the Safe Browsing component. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, and Firefox ESR 153.1.

    CVE-2026-74953:
    Privilege escalation in the Networking: Cookies component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74949:
    Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was     fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74948:
    Information disclosure in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR     115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74946:
    Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This     vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74945:
    Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74944:
    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR     140.14, and Firefox ESR 153.1.

    CVE-2026-74943:
    Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox     ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74942:
    Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74941:
    Privilege escalation in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154,     Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74939:
    Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74936:
    Use-after-free in the JavaScript WebAssembly component. Fixed in Firefox 154, Firefox ESR 140.14, and     Firefox ESR 153.1.

    CVE-2026-74935:
    Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-74934:
    Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154,     Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

    CVE-2026-16365:
    Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4775 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4775-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/               Emilio Pozuelo Monfort     September 07, 2026                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : thunderbird     Version        : 1:140.15.0esr-1~deb12u1     CVE ID         : CVE-2026-16365 CVE-2026-16371 CVE-2026-75874 CVE-2026-84119                      CVE-2026-84120 CVE-2026-84121 CVE-2026-84122 CVE-2026-84124                      CVE-2026-84131 CVE-2026-84143 CVE-2026-84145 CVE-2026-84639                      CVE-2026-84640 CVE-2026-84641

    Multiple security issues were discovered in Thunderbird, which could     result in the execution of arbitrary code or information disclosure.

    For Debian 12 bookworm, these problems have been fixed in version     1:140.15.0esr-1~deb12u1.

    We recommend that you upgrade your thunderbird packages.

    For the detailed security status of thunderbird please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/thunderbird

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-firefox installed on the remote host is prior to 140.15.0esr / 153.2.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-247-02 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-firefox security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-thunderbird installed on the remote host is prior to 140.15.0esr / 153.2.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-247-03 advisory.

    New mozilla-thunderbird packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-thunderbird security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6483 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6483-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     September 04, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : thunderbird     CVE ID         : CVE-2026-16365 CVE-2026-16371 CVE-2026-75874 CVE-2026-84119                      CVE-2026-84120 CVE-2026-84121 CVE-2026-84122 CVE-2026-84124                      CVE-2026-84131 CVE-2026-84143 CVE-2026-84145 CVE-2026-84639                      CVE-2026-84640 CVE-2026-84641

    Multiple security issues were discovered in Thunderbird, which could     result in the execution of arbitrary code or information disclosure.

    For the stable distribution (trixie), these problems have been fixed in     version 1:140.15.0esr-1~deb13u1.

    We recommend that you upgrade your thunderbird packages.

    For the detailed security status of thunderbird please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/thunderbird

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4770 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4770-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/               Emilio Pozuelo Monfort     September 04, 2026                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : firefox-esr     Version        : 140.15.0esr-1~deb12u1     CVE ID         : CVE-2026-16365 CVE-2026-16371 CVE-2026-75874 CVE-2026-84119                      CVE-2026-84120 CVE-2026-84121 CVE-2026-84122 CVE-2026-84124                      CVE-2026-84131 CVE-2026-84143 CVE-2026-84145

    Multiple security issues have been found in the Mozilla Firefox web     browser, which could potentially result in the execution of arbitrary     code, sandbox escape or privilege escalation.

    For Debian 12 bookworm, these problems have been fixed in version     140.15.0esr-1~deb12u1.

    We recommend that you upgrade your firefox-esr packages.

    For the detailed security status of firefox-esr please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6481 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6481-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     September 02, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : firefox-esr     CVE ID         : CVE-2026-16365 CVE-2026-16371 CVE-2026-75874 CVE-2026-84119                      CVE-2026-84120 CVE-2026-84121 CVE-2026-84122 CVE-2026-84124                      CVE-2026-84131 CVE-2026-84143 CVE-2026-84145

    Multiple security issues have been found in the Mozilla Firefox web     browser, which could potentially result in the execution of arbitrary     code, sandbox escape or privilege escalation.

    For the stable distribution (trixie), these problems have been fixed in     version 140.15.0esr-1~deb13u1.

    We recommend that you upgrade your firefox-esr packages.

    For the detailed security status of firefox-esr please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 140.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-87 advisory.

  - Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird     140.15, and Thunderbird 153.2. (CVE-2026-84131)

  - Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154,     Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and     Thunderbird 153.2. (CVE-2026-75874)

  - Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.
    (CVE-2026-84639)

  - A maliciously constructed mail header could lead to a one byte read past the end of a buffer.
    (CVE-2026-84640)

  - A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID     response. Heap contents can ultimately be persisted to prefs.js. (CVE-2026-84641)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 140.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-87 advisory.

  - Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in     Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird     140.15, and Thunderbird 153.2. (CVE-2026-84131)

  - Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154,     Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and     Thunderbird 153.2. (CVE-2026-75874)

  - Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.
    (CVE-2026-84639)

  - A maliciously constructed mail header could lead to a one byte read past the end of a buffer.
    (CVE-2026-84640)

  - A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID     response. Heap contents can ultimately be persisted to prefs.js. (CVE-2026-84641)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 140.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-84 advisory.

  - Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154 and     Thunderbird 154. (CVE-2026-75874)

  - Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153,     Thunderbird 153, and Firefox ESR 140.15. (CVE-2026-16365)

  - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     115.40, Firefox ESR 140.15, and Firefox ESR 153.2. (CVE-2026-84120)

  - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     140.15, and Firefox ESR 153.2. (CVE-2026-84122)

  - Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, and Firefox ESR 140.15. (CVE-2026-16371)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 140.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-84 advisory.

  - Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154 and     Thunderbird 154. (CVE-2026-75874)

  - Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153,     Thunderbird 153, and Firefox ESR 140.15. (CVE-2026-16365)

  - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     115.40, Firefox ESR 140.15, and Firefox ESR 153.2. (CVE-2026-84120)

  - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     140.15, and Firefox ESR 153.2. (CVE-2026-84122)

  - Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, and Firefox ESR 140.15. (CVE-2026-16371)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6dab7a3eff advisory.

    - Update to latest upstream (153.0)

    ----

    - New upstream release (153.0)

    ----

    - Updated to latest upstream (153.0)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153,     Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15. (CVE-2026-16365)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7d71f89d7e advisory.

    - Update to latest upstream (153.0)

    ----

    - New upstream release (153.0)

    ----

    - Updated to latest upstream (153.0)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-71 advisory.

  - Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16360, CVE-2026-16412)

  - Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was     fixed in Firefox 153 and Thunderbird 153. (CVE-2026-16367)

  - The code to parse MIME headers for display when forwarding a message (if the setting to view all headers     was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer     for the headers, and potentially crashing Thunderbird. (CVE-2026-14899)

  - Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16349)

  - Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16350)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-71 advisory.

  - Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16360, CVE-2026-16412)

  - Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was     fixed in Firefox 153 and Thunderbird 153. (CVE-2026-16367)

  - The code to parse MIME headers for display when forwarding a message (if the setting to view all headers     was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer     for the headers, and potentially crashing Thunderbird. (CVE-2026-14899)

  - Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16349)

  - Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16350)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-68 advisory.

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was     fixed in Firefox 153 and Thunderbird 153. (CVE-2026-16367)

  - Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16349)

  - Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16350)

  - Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 153, Firefox     ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16362)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-68 advisory.

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was     fixed in Firefox 153 and Thunderbird 153. (CVE-2026-16367)

  - Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153,     Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16349)

  - Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16350)

  - Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 153, Firefox     ESR 140.13, Thunderbird 153, and Thunderbird 140.13. (CVE-2026-16362)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
348282	SUSE SLED15: MozillaThunderbird / MozillaThunderbird-translations-common / etc (SUSE-SU-2026:4268-1)	Nessus	SuSE Local Security Checks	Local	critical
347005	Oracle Linux 8 : firefox (ELSA-2026-68549)	Nessus	Oracle Linux Local Security Checks	Local	critical
346212	SUSE SLED15: MozillaFirefox / MozillaFirefox-branding-SLE / MozillaFirefox-devel / etc (SUSE-SU-2026:4156-1)	Nessus	SuSE Local Security Checks	Local	critical
345904	Oracle Linux 9 : ELSA-2026-67133-0: / firefox (ELSA-2026-671330)	Nessus	Oracle Linux Local Security Checks	Local	critical
345696	Oracle Linux 10 : ELSA-2026-67129-0: / firefox (ELSA-2026-671290)	Nessus	Oracle Linux Local Security Checks	Local	critical
344400	TencentOS Server 4: firefox (TSSA-2026:0982)	Nessus	Tencent Local Security Checks	Local	critical
343416	Debian dla-4775 : thunderbird - security update	Nessus	Debian Local Security Checks	Local	critical
343052	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2026-247-02)	Nessus	Slackware Local Security Checks	Local	critical
343051	Slackware Linux 15.0 / current mozilla-thunderbird Multiple Vulnerabilities (SSA:2026-247-03)	Nessus	Slackware Local Security Checks	Local	critical
342858	Debian dsa-6483 : thunderbird - security update	Nessus	Debian Local Security Checks	Local	critical
342790	Debian dla-4770 : firefox-esr - security update	Nessus	Debian Local Security Checks	Local	critical
342669	openSUSE 16: MozillaFirefox / MozillaFirefox-branding-upstream / etc (openSUSE-SU-2026:21713-1)	Nessus	SuSE Local Security Checks	Local	critical
342446	Debian dsa-6481 : firefox-esr - security update	Nessus	Debian Local Security Checks	Local	critical
342258	Mozilla Thunderbird < 140.15	Nessus	Windows	Local	critical
342257	Mozilla Thunderbird < 140.15	Nessus	MacOS X Local Security Checks	Local	critical
342132	Mozilla Firefox ESR < 140.15	Nessus	MacOS X Local Security Checks	Local	critical
342131	Mozilla Firefox ESR < 140.15	Nessus	Windows	Local	critical
329998	Fedora 43 : firefox (2026-6dab7a3eff)	Nessus	Fedora Local Security Checks	Local	critical
329436	Linux Distros Unpatched Vulnerability : CVE-2026-16365	Nessus	Misc.	Local	high
329269	Fedora 44 : firefox (2026-7d71f89d7e)	Nessus	Fedora Local Security Checks	Local	critical
329090	Mozilla Thunderbird < 153.0	Nessus	MacOS X Local Security Checks	Local	critical
329088	Mozilla Thunderbird < 153.0	Nessus	Windows	Local	critical
328774	Mozilla Firefox < 153.0	Nessus	MacOS X Local Security Checks	Local	critical
328773	Mozilla Firefox < 153.0	Nessus	Windows	Local	critical

Detections

Analytics

CVE-2026-16365

high

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

high

critical

critical

critical

critical

critical