Detections
Analytics

Mozilla Firefox < 154.0

critical Nessus Plugin ID 337629

Synopsis

A web browser installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Firefox installed on the remote Windows host is prior to 154.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-74 advisory.

 - Internally found bugs present in Firefox ESR 115.38, Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. (CVE-2026-74990)

 - Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. (CVE-2026-74987)

 - Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. (CVE-2026-74988)

 - Internally found bugs present in Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. (CVE-2026-74989)

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 version 154.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-74/

Plugin Details

Severity: Critical

ID: 337629

File Name: mozilla_firefox_154_0.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 8/18/2026

Updated: 8/18/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-74990

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: installed_sw/Mozilla Firefox

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/18/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-74934, CVE-2026-74935, CVE-2026-74936, CVE-2026-74937, CVE-2026-74938, CVE-2026-74939, CVE-2026-74940, CVE-2026-74941, CVE-2026-74942, CVE-2026-74943, CVE-2026-74944, CVE-2026-74945, CVE-2026-74946, CVE-2026-74947, CVE-2026-74948, CVE-2026-74949, CVE-2026-74950, CVE-2026-74951, CVE-2026-74952, CVE-2026-74953, CVE-2026-74954, CVE-2026-74955, CVE-2026-74956, CVE-2026-74957, CVE-2026-74958, CVE-2026-74959, CVE-2026-74960, CVE-2026-74961, CVE-2026-74962, CVE-2026-74963, CVE-2026-74964, CVE-2026-74965, CVE-2026-74966, CVE-2026-74967, CVE-2026-74968, CVE-2026-74969, CVE-2026-74970, CVE-2026-74971, CVE-2026-74972, CVE-2026-74973, CVE-2026-74974, CVE-2026-74975, CVE-2026-74976, CVE-2026-74977, CVE-2026-74978, CVE-2026-74979, CVE-2026-74980, CVE-2026-74981, CVE-2026-74982, CVE-2026-74983, CVE-2026-74984, CVE-2026-74985, CVE-2026-74986, CVE-2026-74987, CVE-2026-74988, CVE-2026-74989, CVE-2026-74990, CVE-2026-75874