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8.8 High

CVE-2022-22761 Web-accessible extension pages (pages with a moz-extension:// scheme) were not correctly enforcing the frame-ancestors…

Description

Web-accessible extension pages (pages with a moz-extension:// scheme) were not correctly enforcing the frame-ancestors directive when it was used in the Web Extension's Content Security Policy. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.

Affected products and versions

Product Affected versions Fixed in
Firefox 97 earliest → < 97 97
Thunderbird 91.6 earliest → < 91.6 91.6
Firefox ESR 91.6 earliest → < 91.6 91.6

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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