CVE-2026-104810 Mitel CVE debrief

Who should care

System administrators and security teams responsible for Mitel MiVoice Office 400 deployments should assess exposure to this vulnerability and prioritize remediation efforts to prevent potential denial-of-service conditions.

Why it matters

CVE-2026-104810 is a high-severity vulnerability in Mitel MiVoice Office 400 that allows authenticated remote attackers to delete sensitive files, potentially leading to a denial-of-service condition. System administrators and security teams should assess exposure, restrict access to the file management interface, and monitor for suspicious activities.

• Potential denial-of-service condition affecting the underlying system
• Deletion of critical system or application files
• Requires authentication to exploit
• Verification of file management interface access controls and monitoring for suspicious activities

Technical summary

The vulnerability exists in the web portal's file management interface on TCP port 443, specifically under Maintenance → File Management → File Browser. An authenticated attacker can exploit this vulnerability to access and delete files outside of the intended directory, including system and application files, potentially resulting in a denial-of-service condition. This can lead to significant operational impact, including potential disruption of critical system functions and data integrity. System administrators and security teams should assess exposure, restrict access to the file management interface, and monitor for suspicious activities to mitigate potential risks.

Defensive priority

High-priority assessment and remediation recommended for Mitel MiVoice Office 400 deployments, focusing on restricting access to the file management interface and monitoring for suspicious file deletion activities.

Recommended defensive actions

• Assess exposure of Mitel MiVoice Office 400 installations to this vulnerability
• Restrict access to the file management interface in the web portal
• Monitor for suspicious file deletion activities on the system
• Verify authentication mechanisms for the file management interface
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its high CVSS score of 8.4 and the requirement for authentication to exploit. However, specific affected versions and remediation steps are not provided in the source corpus.

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.