Detections
Analytics
Mozilla Firefox ESR < 140.10.2
high Nessus Plugin ID 313048
Synopsis
A web browser installed on the remote Windows host is affected by multiple vulnerabilities.Description
The version of Firefox ESR installed on the remote Windows host is prior to 140.10.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-41 advisory.- Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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-2026-8092)
- Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2. (CVE-2026-8090)
- Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2. (CVE-2026-8094)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Mozilla Firefox ESR version 140.10.2 or later.See Also
https://www.mozilla.org/en-US/security/advisories/mfsa2026-41/
Plugin Details
Severity: High
ID: 313048
File Name: mozilla_firefox_140_10_2_esr.nasl
Version: 1.2
Type: Local
Agent: windows
Family: Windows
Published: 5/7/2026
Updated: 5/7/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
CVSS v2
Risk Factor: High
Base Score: 7.5
Temporal Score: 5.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2026-8092
CVSS v3
Risk Factor: High
Base Score: 7.3
Temporal Score: 6.4
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2026-8090
Vulnerability Information
CPE: cpe:/a:mozilla:firefox_esr
Required KB Items: installed_sw/Mozilla Firefox ESR
Exploit Ease: No known exploits are available
Patch Publication Date: 5/7/2026
Vulnerability Publication Date: 5/7/2026