CVE-2026-100807

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 157 Firefox ESR versions prior to 153.4 Firefox ESR versions prior to 140.17 Thunderbird versions prior to 157

Description Privilege escalation exists within the DOM: Service Workers component. Service Workers are scripts that the browser runs in the background, separate from a web page, enabling features like push notifications and offline access.

Recommendations Update Firefox to version 157. Update Firefox ESR to version 153.4. Update Firefox ESR to version 140.17. Update Thunderbird to version 157.