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6.1 Medium

CVE-2025-11712 A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when…

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 144 earliest → < 144 144
Firefox 140.4 earliest → < 140.4 140.4
Firefox ESR 140.4 earliest → < 140.4 140.4
Thunderbird 144 earliest → < 144 144
Thunderbird 140.4 earliest → < 140.4 140.4

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High
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