CVE-2026-104811 Mitel CVE debrief

Who should care

System administrators and security teams responsible for the product's Music on Hold functionality should assess exposure and prioritize patching to prevent potential full compromise of the underlying Linux system. They should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-104811 is a high-severity vulnerability in the product's Music on Hold functionality that allows remote attackers to execute arbitrary code. System administrators and security teams should assess exposure and prioritize patching to prevent potential full compromise of the underlying Linux system.

• Remote code execution can lead to full compromise of the underlying Linux system
• Authentication may be required to exploit this vulnerability
• Verify and patch affected installations to prevent exploitation

Technical summary

The vulnerability exists within the Configuration → Services → Music on Hold functionality of the web portal listening on TCP port 443. An attacker can exploit this behavior to upload a malicious shared object (.so) instead of a WAV file, leading to remote code execution in the context of the affected process. The application fails to properly validate uploaded file types, allowing attackers to upload malicious shared objects. This can result in remote code execution and potentially full compromise of the underlying Linux system.

Defensive priority

High priority for system administrators and security teams to verify and patch affected installations

Recommended defensive actions

• Verify and patch affected installations
• Restrict access to the web portal
• Monitor for suspicious uploads and activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability was discovered by DigitalCanion SA and exists in the web portal listening on TCP port 443. The application fails to properly validate uploaded file types, allowing attackers to upload malicious shared objects. The source details are limited, and defenders should verify the affected installations and patch them to prevent exploitation.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.