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8.1 High

CVE-2026-74981 Site isolation issue in the Audio/Video: Web Codecs component

Description

Site isolation issue in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 154 earliest → < 154 154
Firefox 153.1 earliest → < 153.1 153.1
Thunderbird 154 earliest → < 154 154
Thunderbird 153.1 earliest → < 153.1 153.1

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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