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4.3 Medium

CVE-2025-5263 Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin…

Description

Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, 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 115.24 earliest → < 115.24 115.24
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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