Improper privilege management in Firefox ESR - CVE-2026-8957
Published: May 19, 2026
Vulnerability identifier: #VU131842
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-8957
CWE-ID: CWE-269
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Firefox ESR
Firefox ESR
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to improper access control in the Enterprise Policies component when modifying enterprise policy handling. A local user can manipulate enterprise policy behavior to escalate privileges.
How to mitigate CVE-2026-8957
Install security update from vendor's website.