CVE-2026-104810: Mitel MiVoice Office 400

High severity, CVSS 8.4. EPSS: 0.4% chance of exploitation in the next 30 days.

This vulnerability allows remote attackers to delete sensitive files on vulnerable installations of Mitel MiVoice Office 400. Authentication is required to exploit this vulnerability. The specific flaw exists within the web portal listening on TCP port 443, under Maintenance → File Management → File Browser, which is affected by a directory traversal vulnerability. By exploiting this vulnerability, an authenticated attacker can access and delete files outside of the intended directory, including files belonging to the Mitel application and the underlying Linux system. Deleting critical system or application files can result in a denial-of-service condition affecting the underlying system.

Affected products

• Mitel Mitel MiVoice Office 400: version 11.0.96.0 only

Published 2026-10-05. Last modified 2026-10-06.