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8.8 High

CVE-2026-74942 Privilege escalation in the Remote Settings Client component

Description

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, 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
Firefox 140.14 earliest → < 140.14 140.14
Firefox 115.39 earliest → < 115.39 115.39
Thunderbird 154 earliest → < 154 154
Thunderbird 153.1 earliest → < 153.1 153.1
Thunderbird 140.14 earliest → < 140.14 140.14

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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