Mohamed Mbarek

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 155 Firefox ESR versions prior to 153.2 Thunderbird versions prior to 155 Thunderbird versions prior to 153.2 **Description** A site isolation issue exists within the DOM Navigation component. Site isolation is a security mechanism that ensures web pages from different sites are processed in separate processes to prevent data leakage. **Recommendations** Update Firefox to version 155. Update Firefox ESR to version 153.2. Update Thunderbird to version 155. Update Thunderbird to version 153.2.