CVE-2026-104811: CWE-434 — Unrestricted Upload of File with Dangerous Type in Mitel Mitel MiVoice Office 400
Description
DigitalCanion SA has discovered a vulnerability that allows remote attackers to execute arbitrary code on affected installations of the product. Authentication may be required to exploit this vulnerability. The specific flaw exists within the Configuration → Services → Music on Hold functionality of the web portal listening on TCP port 443. The application is intended to allow users to upload WAV audio files but fails to properly validate the uploaded file type. An attacker can exploit this behavior to upload a malicious shared object (.so) instead of a WAV file. When the uploaded file is subsequently processed by the affected component, attacker-controlled code is loaded and executed in the context of the affected process. This can result in remote code execution and potentially full compromise of the underlying Linux system.
CVSS v4.0
Score 8.4high
Affected software
Mitel
Mitel MiVoice Office 400
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper file type validation in the Configuration → Services → Music on Hold feature of the Mitel MiVoice Office 400 web portal (TCP port 443). The application expects WAV files but does not restrict uploads to this type, allowing attackers with authentication to upload malicious .so files. These files are then executed by the system, enabling remote code execution and full system compromise. The CVSS 4.0 score is 8.4, indicating high severity. The affected version is exactly 11.0.96.0.
Potential Impact
Successful exploitation allows an authenticated remote attacker to execute arbitrary code on the affected system with the privileges of the service processing the uploaded file. This can lead to full compromise of the underlying Linux operating system hosting the Mitel MiVoice Office 400 application.
Mitigation Recommendations
No official patch or remediation details are provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the vulnerable upload functionality to trusted users only and monitor for suspicious activity related to file uploads.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- NCSC.ch
- Date Reserved
- 2026-10-02T13:47:47.693Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac368042cdf04f656e4401a
Added to database: 10/05/2026, 09:04:04 UTC
Last enriched: 10/05/2026, 09:18:10 UTC
Last updated: 10/05/2026, 18:56:34 UTC
Views: 16
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