Description
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.
References (6)
Core 6
Core References
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1999257
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-01/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-02/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-03/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-05/
Scores
CVSS v3
8.1
EPSS
0.0031
EPSS Percentile
22.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-693
Status
published
Products (9)
mozilla/firefox
< 115.32.0
mozilla/firefox
< 147.0
Mozilla/Firefox
115.32 - 115.*
Mozilla/Firefox
140.7 - 140.*
Mozilla/Firefox
147
mozilla/thunderbird
< 140.7.0
mozilla/thunderbird
< 147.0
Mozilla/Thunderbird
140.7 - 140.*
Mozilla/Thunderbird
147
Published
Jan 13, 2026
Tracked Since
Feb 18, 2026