Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
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
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 8
https://bugzilla.mozilla.org/show_bug.cgi?id=2057988
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-100/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-97/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-98/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-99/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-101/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-102/
security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-103/
security@mozilla.org