The version of Firefox ESR installed on the remote Windows host is prior to 140.13. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-70 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)

  - We are aware that exploit code for this is public however we are not aware of any attacks in the wild     abusing this flaw. (CVE-2026-15718, CVE-2026-15719)

  - 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.

Detections

Analytics

Mozilla Firefox ESR < 140.13

critical Nessus Plugin ID 328771

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.4 Jul 31, 2026, 6:44 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202607311844
Version 1.3 Jul 23, 2026, 3:57 AM CVSS metrics ("CVSSv2 score" set to 10.0) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C") CVSSv2 severity (based on CVE-2026-15719, severity increased from "Medium" to "High") Plugin metadata Plugin Feed: 202607230357
Version 1.2 Jul 22, 2026, 11:38 AM CVSS metrics ("CVSSv3 score" set to 9.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSSv3 score source (set to "CVE-2026-16412") CVSSv3 severity (based on CVE-2026-16412, severity increased from "Medium" to "High") Plugin Feed: 202607221138
Version 1.1 Jul 21, 2026, 8:31 PM New Plugin Feed: 202607212031