Serial number: AV26-726
Date: July 21, 2026
On July 21, 2026, Mozilla published security advisories to address vulnerabilities in the following products. Included were critical updates for the following:
- Firefox ESR – versions prior to 140.13
- Firefox ESR – versions prior to 115.38
- Firefox – versions prior to 153
The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.