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8.8 High

CVE-2024-8382 Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for…

Description

Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Web content that tried to use those interfaces would not be able to use them with elevated privileges, but their presence would indicate certain browser features had been used, such as when a user opened the Dev Tools console. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, Firefox ESR < 115.15, Thunderbird < 128.2, and Thunderbird < 115.15.

Affected products and versions

Product Affected versions Fixed in
Firefox 130 earliest → < 130 130
Firefox ESR 115.15 earliest → < 115.15 115.15
Thunderbird 115.15 earliest → < 115.15 115.15
firefox_esr 128.2 earliest → < 128.2 128.2
firefox_esr 115.15 earliest → < 115.15 115.15

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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