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CVE-2021-38497 Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another…

Description

Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 93 earliest → < 93 93
Thunderbird 91.2 earliest → < 91.2 91.2
Firefox ESR 91.2 earliest → < 91.2 91.2

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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