Mozilla security advisory (AV26-372)

Serial number: AV26-372
Date: April 21, 2026

On April 21, 2026, Mozilla published security advisories to address vulnerabilities in the following products:

• Firefox – versions prior to 150
• Firefox ESR – versions prior to 35
• Firefox ESR – versions prior to 10

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

• Security Vulnerabilities fixed in Firefox ESR 140.10
• Security Vulnerabilities fixed in Firefox ESR 115.35
• Security Vulnerabilities fixed in Firefox 150
• Mozilla Security Advisories