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4.3 Medium

CVE-2025-5266 Script elements loading cross-origin resources generated load and error events which leaked information enabling…

Description

Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Affected products and versions

Product Affected versions Fixed in
Firefox 139 earliest → < 139 139
Firefox 128.11 earliest → < 128.11 128.11
Firefox ESR 128.11 earliest → < 128.11 128.11
Thunderbird 139 earliest → < 139 139
Thunderbird 128.11 earliest → < 128.11 128.11

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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