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6.5 Medium

CVE-2026-6763 Mitigation bypass in the File Handling component

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Affected products and versions

Product Affected versions Fixed in
Firefox 150 earliest → < 150 150
Firefox 140.10 earliest → < 140.10 140.10
Thunderbird 150 earliest → < 150 150
Thunderbird 140.10 earliest → < 140.10 140.10

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-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
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