Mozilla security advisory (AV26-726)

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        <div><p><strong>Serial number:</strong> AV26-726<br /><strong>Date:</strong> July 21, 2026</p>

On July 21, 2026, Mozilla published security advisories to address vulnerabilities in the following products. Included were critical updates for the following:

• Firefox ESR – versions prior to 140.13
• Firefox ESR – versions prior to 115.38
• Firefox – versions prior to 153

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

• Mozilla Foundation Security Advisory 2026-70
• Mozilla Foundation Security Advisory 2026-69
• Mozilla Foundation Security Advisory 2026-68
• Mozilla Security Advisories

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Article Link: Mozilla security advisory (AV26-726) - Canadian Centre for Cyber Security