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CVE-2023-4054 When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code

Description

When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 102.14, Firefox ESR < 115.1, Thunderbird < 102.14, and Thunderbird < 115.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 116 earliest → < 116 116
Firefox ESR 115.1 earliest → < 115.1 115.1
Thunderbird 115.1 earliest → < 115.1 115.1

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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