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Mozilla Firefox ESR < 115.38

critical Nessus Plugin ID 328775

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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 115.38. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-69 advisory.

 - 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-2026-15719)

 - Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16349)

 - Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16351)

 - Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16353)

 - JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16355)

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 115.38 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-69/

Plugin Details

Severity: Critical

ID: 328775

File Name: macos_firefox_115_38_esr.nasl

Version: 1.3

Type: Local

Agent: macosx

Published: 7/21/2026

Updated: 7/27/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-15719

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

CVSS Score Source: CVE-2026-16361

Vulnerability Information

CPE: cpe:/a:mozilla:firefox_esr

Required KB Items: installed_sw/Mozilla Firefox ESR

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/21/2026

Vulnerability Publication Date: 7/14/2026

Reference Information

CVE: CVE-2026-15719, CVE-2026-16349, CVE-2026-16350, CVE-2026-16351, CVE-2026-16352, CVE-2026-16353, CVE-2026-16354, CVE-2026-16355, CVE-2026-16356, CVE-2026-16357, CVE-2026-16358, CVE-2026-16359, CVE-2026-16360, CVE-2026-16361

IAVA: 2026-A-0755