Mozilla security advisory (AV26-644)

Serial number: AV26-644
Date: June 30, 2026

On June 30, 2026, Mozilla published a security advisory to address a vulnerability in the following product:

• Firefox – versions prior to 152.04
• Thunderbird – versions prior to 140.12.1
• Thunderbird – versions prior to 152.01

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

• Mozilla Foundation Security Advisory 2026-62
• Mozilla Security Advisories