The version of Firefox installed on the remote macOS or Mac OS X host is prior to 148.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-13 advisory.

  - Memory safety bugs present in Firefox 147 and Thunderbird 147. 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-2026-2807)

  - Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability     affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird <     140.8. (CVE-2026-2778)

  - Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2757)

  - Information disclosure due to uninitialized memory in Firefox and Firefox Focus for Android. This     vulnerability affects Firefox < 148. (CVE-2026-2794)

  - Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148, Firefox ESR <     115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (CVE-2026-2758)

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 148.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-16 advisory.

  - Memory safety bugs present in Firefox 147 and Thunderbird 147. 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-2026-2807)

  - Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability     affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird <     140.8. (CVE-2026-2778)

  - Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2757)

  - Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148, Firefox ESR <     115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (CVE-2026-2758)

  - Incorrect boundary conditions in the Graphics: ImageLib component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2759)

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-2026-766e3a6ec8 advisory.

    - New upstream release (148.0)

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 Firefox installed on the remote Windows host is prior to 148.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-13 advisory.

  - Memory safety bugs present in Firefox 147 and Thunderbird 147. 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-2026-2807)

  - Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability     affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird <     140.8. (CVE-2026-2778)

  - Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2757)

  - Information disclosure due to uninitialized memory in Firefox and Firefox Focus for Android. This     vulnerability affects Firefox < 148. (CVE-2026-2794)

  - Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148, Firefox ESR <     115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (CVE-2026-2758)

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 148.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-16 advisory.

  - Memory safety bugs present in Firefox 147 and Thunderbird 147. 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-2026-2807)

  - Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability     affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird <     140.8. (CVE-2026-2778)

  - Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2757)

  - Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 148, Firefox ESR <     115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (CVE-2026-2758)

  - Incorrect boundary conditions in the Graphics: ImageLib component. This vulnerability affects Firefox <     148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
    (CVE-2026-2759)

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 42 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-0709b275a5 advisory.

    Update NSS to 3.120.1     Update to Firefox 148.0

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 remote Fedora 44 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-b5bde68630 advisory.

    Update NSS to 3.120.1     Update to Firefox 148.0

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.

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox     148 and Thunderbird 148. (CVE-2026-2800)

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

ID	Name	Product	Family	Published	Updated	Severity
299866	Mozilla Firefox < 148.0	Nessus	MacOS X Local Security Checks	2/24/2026	3/2/2026	critical
299889	Mozilla Thunderbird < 148.0	Nessus	MacOS X Local Security Checks	2/24/2026	3/9/2026	critical
300114	Fedora 43 : firefox (2026-766e3a6ec8)	Nessus	Fedora Local Security Checks	2/28/2026	3/6/2026	critical
299865	Mozilla Firefox < 148.0	Nessus	Windows	2/24/2026	3/2/2026	critical
299891	Mozilla Thunderbird < 148.0	Nessus	Windows	2/24/2026	3/9/2026	critical
300500	Fedora 42 : firefox / nss (2026-0709b275a5)	Nessus	Fedora Local Security Checks	3/4/2026	3/4/2026	critical
301445	Fedora 44 : firefox / nss (2026-b5bde68630)	Nessus	Fedora Local Security Checks	3/7/2026	3/7/2026	critical
300139	Linux Distros Unpatched Vulnerability : CVE-2026-2800	Nessus	Misc.	3/1/2026	4/22/2026	critical

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