Mitel MiVoice Office 400 Music on Hold WAV File Upload Code Execution

published 2026-10-05 last mo. modified 2026-10-06 last mo. also EUVD-2026-92305

cvss: 8.4; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits: 0; none known

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.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: last mo. (2026-10-05)

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/AU:Y/U:Amber
CNA	4.0	8.4	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Amber

Affected products

Mitel Mitel MiVoice Office 400

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-20 Improper Input Validation
CWE-94 Improper Control of Generation of Code
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

References

digitalcanion.com /en/security-research/#vendor=mitel&status=cna

Sources

CVE List CVE-2026-104811
NVD CVE-2026-104811

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