Same-origin policy bypass in the Layout component
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.3%
exploitation probability
0.3%top 77% of all CVEs
observed exploitation
nono source reports it
Same-origin policy bypass in the Layout component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1970490https://lists.debian.org/debian-lts-announce/2025/09/msg00020.htmlhttps://lists.debian.org/debian-lts-announce/2025/09/msg00026.htmlhttps://www.mozilla.org/security/advisories/mfsa2025-73/https://www.mozilla.org/security/advisories/mfsa2025-75/https://www.mozilla.org/security/advisories/mfsa2025-77/https://www.mozilla.org/security/advisories/mfsa2025-78/