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8.8 High

CVE-2026-8970 Privilege escalation in the Security component

Description

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Affected products and versions

Product Affected versions Fixed in
Firefox 151 earliest → < 151 151
Firefox 140.11 earliest → < 140.11 140.11
Thunderbird 151 earliest → < 151 151
Thunderbird 140.11 earliest → < 140.11 140.11

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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