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

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Produits concernés

• Mozilla Firefox
• Mozilla Thunderbird

Scores CVSS

Faiblesses (CWE)

• CWE-116

Références

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

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories