CVE-2025-5266

medium

Description

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

References

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

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

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

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

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

Details

Source: Mitre, NVD

Published: 2025-05-27

Updated: 2025-06-11

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N