Quick answers
- Is CVE-2026-104811 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-104811 being exploited in the wild.
- How severe is CVE-2026-104811?
- Informational severity, published 5 October 2026.
- Which products and versions are affected?
- Mitel MiVoice Office 400 version 11.0.96.0 and earlier.
- Is there a fix for CVE-2026-104811?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-104811 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-104811?
- Check whether you run Mitel MiVoice Office 400 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the Configuration → Services → Music on Hold web portal component (TCP 443) which accepts audio file uploads. An attacker can bypass file type validation to upload a malicious .so (shared object) file instead of a legitimate WAV audio file. When the affected component processes this file, the attacker-controlled code is loaded and executed in the context of the application process, leading to remote code execution and full system compromise.
Affected products
- Mitel MiVoice Office 400 version 11.0.96.0 and earlier
Timeline
- 2026-10-05: disclosed: CVE-2026-104811 / DGI-SWISS-00029 published