Mozilla security advisory (AV26-840)

Serial Number: AV26-840
Date: August 21, 2026

As of August 18, 2026, Mozilla is affected by vulnerabilities in the following products:

  • Firefox
    • versions prior to 154
  • Firefox ESR
    • versions prior to 115.39
    • versions prior to 140.14
    • versions prior to 153.1
  • Thunderbird
    • versions prior to 140.14
    • versions prior to 153.1
    • versions prior to 154

The Cyber Centre encourages users and administrators to review the provided web link and apply any necessary updates as they become available.

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