Detections
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Mozilla Firefox ESR < 115.45

critical Nessus Plugin ID 378429

Synopsis

A web browser installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.

Description

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 115.45. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-126 advisory.

 - Sandbox escape due to use-after-free in the IPC component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, and Thunderbird 160. (CVE-2026-124903)

 - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox ESR 115.45.
 (CVE-2026-124952)

 - Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.45. (CVE-2026-109736)

 - Sandbox escape due to incorrect boundary conditions in the Graphics: Text component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, and Thunderbird 160. (CVE-2026-124853)

 - Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, and Thunderbird 160. (CVE-2026-124857)

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 115.45 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-126/

Plugin Details

Severity: Critical

ID: 378429

File Name: macos_firefox_115_45_esr.nasl

Version: 1.1

Type: Local

Agent: macosx

Published: 11/10/2026

Updated: 11/10/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 92.8

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-124952

CVSS v3

Risk Factor: Critical

Base Score: 9.6

Temporal Score: 8.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-124903

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: 11/10/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-109736, CVE-2026-124853, CVE-2026-124857, CVE-2026-124858, CVE-2026-124859, CVE-2026-124860, CVE-2026-124861, CVE-2026-124863, CVE-2026-124864, CVE-2026-124865, CVE-2026-124872, CVE-2026-124874, CVE-2026-124875, CVE-2026-124876, CVE-2026-124877, CVE-2026-124880, CVE-2026-124881, CVE-2026-124882, CVE-2026-124885, CVE-2026-124890, CVE-2026-124895, CVE-2026-124898, CVE-2026-124899, CVE-2026-124901, CVE-2026-124902, CVE-2026-124903, CVE-2026-124905, CVE-2026-124952