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9.1 Critical

CVE-2025-4083 A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow…

Description

A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

Affected products and versions

Product Affected versions Fixed in
Firefox 138 earliest → < 138 138
Firefox 128.10 earliest → < 128.10 128.10
Firefox 115.23 earliest → < 115.23 115.23
Firefox ESR 115.23 earliest → < 115.23 115.23
Thunderbird 138 earliest → < 138 138
Thunderbird 128.10 earliest → < 128.10 128.10

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-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High
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