Mozilla security advisory (AV26-323)

Serial number: AV26-323
Date: April 7, 2026

On April 7, 2026, Mozilla published security advisories to address vulnerabilities in the following products:

• Firefox – versions prior to 149.0.2
• Firefox ESR – versions prior to 34.1
• Firefox ESR – versions prior to 9.1

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

• Security Vulnerabilities fixed in Firefox ESR 140.9.1
• Security Vulnerabilities fixed in Firefox ESR 115.34.1
• Security Vulnerabilities fixed in Firefox 149.0.2
• Mozilla Security Advisories