CVE-2025-5266 Information

Description

Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 https://www.mozilla.org/security/advisories/mfsa2025-42/ https://www.mozilla.org/security/advisories/mfsa2025-44/