Improper access control in Mozilla products - CVE-2026-74935
Published: August 18, 2026
Vulnerability identifier: #VU144046
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74935
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to improper access control in the DOM: Networking component when handling web content. A remote attacker can trigger crafted browser interactions to escalate privileges.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Firefox ESR
Firefox for Android
How to mitigate CVE-2026-74935
Install security update from vendor's website.
Mozilla Firefox - update to 154.0
Firefox for Android - update to 154.0
Firefox ESR - addressed in versions 115.39.0, 140.14.0, 153.1.0
Firefox for Android - update to 154.0
Firefox ESR - addressed in versions 115.39.0, 140.14.0, 153.1.0
External References
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-75/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-77/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-76/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-74/
- https://bugzilla.mozilla.org/show_bug.cgi?id=2051013