Mozilla · Firefox · CVE-2026-74982
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 154
Firefox ESR versions prior to 153.1
Thunderbird versions prior to 154
Thunderbird versions prior to 153.1
**Description**
A denial-of-service issue exists within the Widget component.
**Recommendations**
Update Firefox to version 154.
Update Firefox ESR to version 153.1.
Update Thunderbird to version 154.
Update Thunderbird to version 153.1.