# CVE-2026-104811: Mitel MiVoice Office 400 Music on Hold WAV File Upload Code Execution

> Remote attackers can upload malicious shared objects via the Music on Hold feature to execute arbitrary code on Mitel MiVoice Office 400 systems.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-g7mp-v763-325c

## What is CVE-2026-104811?

CVE-2026-104811 is a high-severity vulnerability in Mitel MiVoice Office 400, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

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

## Which versions are affected by CVE-2026-104811?


## How do I fix CVE-2026-104811?

No fix has been published for CVE-2026-104811 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104811 being exploited?

There is no known exploitation of CVE-2026-104811 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104811 and fix it if it is affected.

What it is: CVE-2026-104811 is a high-severity vulnerability in Mitel MiVoice Office 400, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-104811 in the wild and no public exploit code.

Affected product: Mitel MiVoice Office 400. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-104811/ (Markdown: https://insights.sbomify.com/CVE-2026-104811/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104811
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104811
- OSV: https://osv.dev/vulnerability/CVE-2026-104811

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104811/
Summaries are generated and may contain mistakes; the official description above is the record.