Mitigation Bypass Vulnerability in Firefox by Mozilla
CVE-2026-8969

8.1HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8969?

A mitigation bypass vulnerability exists within the DOM security component of Firefox, which could allow attackers to circumvent intended security protections. This issue has been addressed in Firefox version 151, highlighting the importance of users keeping their browsers updated to safeguard against emerging threats.

Affected Version(s)

Firefox 151

Thunderbird 151

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2031123
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-50/

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Atsushi Sada
.