CVE-2026-104805 Mitel MiVoice Office 400 Backup Restoration Arbitrary File Write Leading to Root Code Execution
An attacker with backup repository access can upload a malicious archive to achieve root code execution on the Mitel MiVoice Office 400 system.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104805?
CVE-2026-104805 is a high-severity path traversal vulnerability in Mitel MiVoice Office 400, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
DigitalCanion has discovered a vulnerability in the backup restoration functionality that allows an attacker with access to the configured backup repository to introduce arbitrary files into the system during restoration.
The specific flaw exists within the backup restoration mechanism, which fails to properly validate the paths, file types, integrity, and authenticity of files contained within a restored TGZ archive. The application does not perform file-signature verification before extracting the archive, allowing a specially crafted backup to contain attacker-controlled files.
An attacker with access to the backup SFTP or other configured repository can therefore provide a malicious TGZ archive that, when restored by the system, may place arbitrary files on the underlying Linux system. Depending on the location and permissions of the extracted files, this behavior can potentially be leveraged to achieve arbitrary code execution with root privileges and compromise the underlying virtual machine.
The absence of enforced backup passwords further reduces the protection provided by the backup mechanism and may facilitate unauthorized access to the repository.
Which versions are affected by CVE-2026-104805?
How do I fix CVE-2026-104805?
No fix has been published for CVE-2026-104805 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-104805 being exploited?
There is no known exploitation of CVE-2026-104805 in the wild and no public exploit code.
Sources
Also known as GHSA-vh23-h9qx-6q3f.