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**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 120 Firefox ESR versions prior to 115.5.0 Thunderbird versions prior to 115.5 **Description** The issue is related to the incorrect handling of the Selection API when using X11, causing text selected by a page to be copied into the primary selection, a temporary storage similar to the clipboard. This bug only affects Firefox on X11, with other systems being unaffected. **Recommendations** For Firefox versions prior to 120, update to version 120 or later. For Firefox ESR versions prior to 115.5.0, update to version 115.5.0 or later. For Thunderbird versions prior to 115.5, update to version 115.5 or later.