Laurin Weger

**Name of the Vulnerable Software and Affected Versions** Thunderbird versions prior to 141 Thunderbird versions prior to 140.1 Firefox versions prior to 141 Firefox ESR versions prior to 140.1 **Description** Thunderbird and Firefox incorrectly handled path validation during frame navigations. This issue could potentially allow for malicious actions due to improper navigation checks within a frame. **Recommendations** Update Thunderbird to version 141 or later. Update Thunderbird to version 140.1 or later. Update Firefox to version 141 or later. Update Firefox ESR to version 140.1 or later.