CVE-2025-11712

Description

A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.

References

https://www.mozilla.org/security/advisories/mfsa2025-85/

https://www.mozilla.org/security/advisories/mfsa2025-84/

https://www.mozilla.org/security/advisories/mfsa2025-83/

https://www.mozilla.org/security/advisories/mfsa2025-81/

https://bugzilla.mozilla.org/show_bug.cgi?id=1979536

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS