CVE-2025-11712

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 was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

• CWE-116

• https://bugzilla.mozilla.org/show_bug.cgi?id=1979536Issue Tracking, Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2025-81/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-83/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-84/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-85/Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html

Published

Oct 14, 2025

Last Modified

Jun 17, 2026

Status

Modified

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