Mitel security advisory (AV26-734)

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        <div><p><strong>Serial number: </strong>AV26-734<br /><strong>Date: </strong>July&nbsp;22, 2026</p>

On July 22, 2026, Mitel published security advisories to address vulnerabilities in the following products. Included were critical updates for the following::

• MiCollab – multiple versions
• OpenScape UC – multiple versions

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

• Mitel Product Security Advisory MISA-2026-0006 - MiCollab Command Injection Vulnerability
• Mitel Product Security Advisory MISA-2026-0007 - OpenScape UC Cross Reflected Site Scripting (XSS) Vulnerability
• Mitel Security Bulletins

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Article Link: Mitel security advisory (AV26-734) - Canadian Centre for Cyber Security