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9.6 Critical

CVE-2026-92018 Sandbox escape in the DOM: Core & HTML component

Description

Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Affected products and versions

Product Affected versions Fixed in
Firefox 156 earliest → < 156 156
Firefox 153.3 earliest → < 153.3 153.3
Firefox 140.16 earliest → < 140.16 140.16
Firefox 115.41 earliest → < 115.41 115.41
Thunderbird 156 earliest → < 156 156
Thunderbird 153.3 earliest → < 153.3 153.3
Thunderbird 140.16 earliest → < 140.16 140.16

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