Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
mozilla:firefox
References 5
https://bugzilla.mozilla.org/show_bug.cgi?id=2067172
NVD
https://www.mozilla.org/security/advisories/mfsa2026-100/
NVD
https://www.mozilla.org/security/advisories/mfsa2026-97/
NVD
https://www.mozilla.org/security/advisories/mfsa2026-101/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-103/
security@mozilla.org