The version of Firefox installed on the remote Windows host is prior to 138.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-28 advisory.

  - Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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-2025-4091)

  - A process isolation vulnerability in Firefox stemmed from improper handling of javascript: URIs, which     could allow content to execute in the top-level document's process instead of the intended frame,     potentially enabling a sandbox escape. (CVE-2025-4083)

  - Mozilla Firefox's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-     level updater by manipulating the file-locking behavior. By injecting code into the user-privileged     process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths     controlled by a non-privileged user and enabling privilege escalation. (CVE-2025-2817)

  - Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained     with other vulnerabilities, could be used to escalate privileges. This bug only affects Firefox for macOS.
    Other versions of Firefox are unaffected. (CVE-2025-4082)

  - An attacker with control over a content process could potentially leverage the privileged UITour actor to     leak sensitive information or escalate privileges. (CVE-2025-4085)

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 138.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-28 advisory.

  - Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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-2025-4091)

  - A process isolation vulnerability in Firefox stemmed from improper handling of javascript: URIs, which     could allow content to execute in the top-level document's process instead of the intended frame,     potentially enabling a sandbox escape. (CVE-2025-4083)

  - Mozilla Firefox's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-     level updater by manipulating the file-locking behavior. By injecting code into the user-privileged     process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths     controlled by a non-privileged user and enabling privilege escalation. (CVE-2025-2817)

  - Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained     with other vulnerabilities, could be used to escalate privileges. This bug only affects Firefox for macOS.
    Other versions of Firefox are unaffected. (CVE-2025-4082)

  - An attacker with control over a content process could potentially leverage the privileged UITour actor to     leak sensitive information or escalate privileges. (CVE-2025-4085)

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

The AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1787115646 advisory.

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox     143 and Thunderbird 143. (CVE-2025-10530)

  - Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143     and Thunderbird 143. (CVE-2025-10531)

  - Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained     with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for     macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138,     Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10. (CVE-2025-4082)

  - A specially crafted filename containing a large number of encoded newline characters could obscure the     file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android.
    Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138 and     Thunderbird 138. (CVE-2025-4086)

  - Due to insufficient escaping of special characters in the copy as cURL feature, an attacker could trick     a user into using this command, potentially leading to local code execution on the user's system. This     vulnerability was fixed in Firefox 138 and Thunderbird 138. (CVE-2025-4089)

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 138.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-31 advisory.

  - Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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-2025-4091)

  - A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which     could allow content to execute in the top-level document's process instead of the intended frame,     potentially enabling a sandbox escape. (CVE-2025-4083)

  - Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level     updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an     attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled     by a non-privileged user and enabling privilege escalation. (CVE-2025-2817)

  - Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained     with other vulnerabilities, could be used to escalate privileges. This bug only affects Thunderbird for     macOS. Other versions of Thunderbird are unaffected. (CVE-2025-4082)

  - An attacker with control over a content process could potentially leverage the privileged UITour actor to     leak sensitive information or escalate privileges. (CVE-2025-4085)

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.

  - A specially crafted filename containing a large number of encoded newline characters could obscure the     file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android.
    Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138 and     Thunderbird 138. (CVE-2025-4086)

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

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-33d579ecb1 advisory.

    - Update to latest upstream (138.0)

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 138.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-31 advisory.

  - Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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-2025-4091)

  - A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which     could allow content to execute in the top-level document's process instead of the intended frame,     potentially enabling a sandbox escape. (CVE-2025-4083)

  - Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level     updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an     attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled     by a non-privileged user and enabling privilege escalation. (CVE-2025-2817)

  - Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained     with other vulnerabilities, could be used to escalate privileges. This bug only affects Thunderbird for     macOS. Other versions of Thunderbird are unaffected. (CVE-2025-4082)

  - An attacker with control over a content process could potentially leverage the privileged UITour actor to     leak sensitive information or escalate privileges. (CVE-2025-4085)

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	Published	Updated	Severity
234924	Mozilla Firefox < 138.0	Nessus	Windows	4/29/2025	11/18/2025	critical
234925	Mozilla Firefox < 138.0	Nessus	MacOS X Local Security Checks	4/29/2025	11/18/2025	critical
360063	AlmaLinux 9.2 [TuxCare] Security Update: thunderbird Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1787115646)	Nessus	Alma Linux Local Security Checks	10/1/2026	10/1/2026	medium
234926	Mozilla Thunderbird < 138.0	Nessus	Windows	4/29/2025	11/18/2025	critical
297163	Linux Distros Unpatched Vulnerability : CVE-2025-4086	Nessus	Misc.	1/29/2026	9/30/2026	medium
235469	Fedora 41 : firefox (2025-33d579ecb1)	Nessus	Fedora Local Security Checks	5/7/2025	5/22/2025	critical
234927	Mozilla Thunderbird < 138.0	Nessus	MacOS X Local Security Checks	4/29/2025	11/18/2025	critical

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