Mitel security advisory (AV26-524)

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        <div><p><strong>Serial number: </strong>AV26-524<br /><strong>Date:&nbsp;</strong>May 28, 2026</p>

On May 28, 2026, Mitel published a security advisory to address vulnerabilities in the following products:

  • Mitel Standard Linux – versions 12.x and prior
  • MiVoice 5000 – versions 8.x and prior
  • MiVoice Border Gateway – versions 11.6.x, 12.x and prior
  • MiVoice Business – versions 10.1.x to 10.5.x
  • MiVoice Business Solution Virtual Instance – versions 2.x and prior
  • MiVoice MX-ONE – versions 7.3 to 7.8 and version 8.x and prior
  • OpenScape 4000 – versions V10 R1.x, V11 R0.22, V11 R1.26 and prior
  • OpenScape Branch – versions V10.3 and V11.x and prior
  • OpenScape SBC – versions V10.3 and V11.x and prior
  • OpenScape Voice Server – versions V9R3 JITC, V10, V11 and prior
  • MiCollab – versions 10.x and prior
  • MiCloud Management Portal – versions 6.3.x and prior
  • Mitel Open Integration Gateway – versions 4.3.x and prior
  • Mitel Performance Analytics MPA – versions 3.6x and prior
  • OpenScape Contact Media Service (used by Mitel CX and OpenScape Contact Center) – versions V12Rx and prior
  • Mitel SIP DECT – versions 9.1, 9.2, 10.0, 10.1 and prior
  • OpenScape Xpert Clients 6010P – versions V7, V8 and prior

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

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Article Link: Mitel security advisory (AV26-524) - Canadian Centre for Cyber Security