Mozilla security advisory (AV26-271)

Serial number: AV26-271
Date: March 24, 2026

On March 24, 2026, Mozilla published security advisories to address vulnerabilities in the following products:

• Firefox – versions prior to 149
• Firefox ESR – versions prior to 115.34
• Firefox ESR – versions prior to 140.9

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

• Security Vulnerabilities fixed in Firefox 149
• Security Vulnerabilities fixed in Firefox ESR 115.34
• Security Vulnerabilities fixed in Firefox ESR 140.9
• Mozilla Security Advisories