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9.6 Critical

CVE-2026-100804 Sandbox escape due to use-after-free in the Preferences: Backend component

Description

Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Affected products and versions

Product Affected versions Fixed in
Firefox 157 earliest → < 157 157
Thunderbird 157 earliest → < 157 157

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-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High
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