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CVE-2023-4053 A website could have obscured the full screen notification by using a URL with a scheme handled by an external…

Description

A website could have obscured the full screen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 116, Firefox ESR < 115.2, and Thunderbird < 115.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 116 earliest → < 116 116
Firefox ESR 115.2 earliest → < 115.2 115.2
Thunderbird 115.2 earliest → < 115.2 115.2

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-2026-118024 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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