Mitigation Bypass in Firefox Security Component
CVE-2026-12316

9.1CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
16 June 2026

What is CVE-2026-12316?

A vulnerability has been identified in the DOM security component of Firefox, allowing for potential mitigation bypass. This issue compromises the security measures designed to protect users. It has been addressed in Firefox version 152, emphasizing the importance of keeping your browser up to date to safeguard against such vulnerabilities. For further details, see the Mozilla security advisories.

Affected Version(s)

Firefox 152

Thunderbird 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2045496
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-60/

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Frederik Braun
.