CVE-2026-92068

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 156 Firefox ESR versions prior to 153.3 Thunderbird versions prior to 156 Thunderbird versions prior to 153.3

Description Site isolation issue in the Reader Mode component. Site isolation is a security mechanism that ensures web pages from different sites are processed in separate processes to prevent one site from accessing data from another.

Recommendations Update Firefox to version 156. Update Firefox ESR to version 153.3. Update Thunderbird to version 156. Update Thunderbird to version 153.3.