CVE-2022-26143 MiCollab, MiVoice Business Express Access Control

Exploited in the wild Critical 9.8 Published 9 Mar 2022 Updated 21 Oct 2025

Remote attackers can access sensitive information and cause denial of service in Mitel MiCollab due to missing authentication in the TP-240 component.

Exploited in the wild: Since 25 Mar 2022
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-26143?

CVE-2022-26143 is a critical missing authorization vulnerability in n/a, published on 9 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The TP-240 (aka tp240dvr) component in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1 allows remote attackers to obtain sensitive information and cause a denial of service (performance degradation and excessive outbound traffic). This was exploited in the wild in February and March 2022 for the TP240PhoneHome DDoS attack.

Weakness: CWE-306

Which versions are affected by CVE-2022-26143?

It affects 2 products.

Products include Mitel Micollab, Mitel Mivoice Business Express.

How do I fix CVE-2022-26143?

No fix has been published for CVE-2022-26143 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 15 Apr 2022.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2022-26143 being exploited?

Yes. Attackers have exploited CVE-2022-26143 in the wild since at least 25 Mar 2022.

Public exploit code: 1 Nuclei template.

Sources

Also known as CVE-2022-26487, GHSA-xh7f-2c8g-37p4.