CVE-2026-0877
HIGH severity · CVSS 8.1 · CWE-693
8.1CVSS HIGH
Summary
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactHigh
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2026-01/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-02/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-03/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-04/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-05/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1999257