CVE-2025-5266

Description

Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

PUBLISHED Reserved 2025-05-27 | Published 2025-05-27 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Jakub Szymsza

References

lists.debian.org/debian-lts-announce/2025/05/msg00046.html

lists.debian.org/debian-lts-announce/2025/05/msg00043.html

bugzilla.mozilla.org/show_bug.cgi?id=1965628

www.mozilla.org/security/advisories/mfsa2025-42/

www.mozilla.org/security/advisories/mfsa2025-44/

www.mozilla.org/security/advisories/mfsa2025-45/

www.mozilla.org/security/advisories/mfsa2025-46/

cve.org (CVE-2025-5266)

nvd.nist.gov (CVE-2025-5266)

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