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6.5 Medium

CVE-2025-1013 A race condition could have led to private browsing tabs being opened in normal browsing windows

Description

A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Affected products and versions

Product Affected versions Fixed in
Firefox 135 earliest → < 135 135
Firefox 128.7 earliest → < 128.7 128.7
Firefox ESR 128.7 earliest → < 128.7 128.7
Thunderbird 135 earliest → < 135 135
Thunderbird 128.7 earliest → < 128.7 128.7

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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