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CVE-2023-6208 When using X11, text selected by the page using the Selection API was erroneously copied into the primary selection, a…

Description

When using X11, text selected by the page using the Selection API was erroneously copied into the primary selection, a temporary storage not unlike the clipboard. *This bug only affects Firefox on X11. Other systems are unaffected.* This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

Affected products and versions

Product Affected versions Fixed in
Firefox 120 earliest → < 120 120
Firefox ESR 115.5 earliest → < 115.5.0 115.5.0
Thunderbird 115.5 earliest → < 115.5 115.5

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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