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CVE-2021-38503 The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions…

Description

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Affected products and versions

Product Affected versions Fixed in
Firefox 94 earliest → < 94 94
Thunderbird 91.3 earliest → < 91.3 91.3
Firefox ESR 91.3 earliest → < 91.3 91.3

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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