CVE-2026-104810: Mitel MiVoice Office 400 File Management File Browser path traversal vulnerability

Vulnerability summary

CVE-2026-104810 is a high (CVSS 8.4) Path Traversal: 'dir\..\..\filename' vulnerability in mitel mitel mivoice office 400. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 32.5% of scored vulnerabilities.

Timeline

1. 05-10-2026
   PublishedVulnerability first disclosed.
2. 05-10-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-31Path Traversal: 'dir\..\..\filename'The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize 'dir\..\..\filename' (multiple internal backslash dot dot) sequences that can resolve to a location that is outside of that directory.