Mozilla · Firefox · CVE-2026-74961
**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 side-channel issue exists within the Web Audio component. A side-channel is a method of extracting information from a system by observing its physical implementation, such as timing or power consumption, rather than exploiting a direct flaw in the code.
**Recommendations**
Update Firefox to version 154.
Update Firefox ESR to version 153.1.
Update Thunderbird to version 154.
Update Thunderbird to version 153.1.