CVE-2026-104807 Mitel MiVoice Office 400 stored Cross-Site Scripting

Low 1.9 Published 5 Oct 2026 Updated 5 Oct 2026

Authenticated attackers can inject persistent JavaScript into the MiVoice Office 400 web portal, enabling content modification and phishing attacks against other users.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-104807?

CVE-2026-104807 is a low-severity cross-site scripting vulnerability in Mitel MiVoice Office 400, published on 5 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability that allows an authenticated malicious user to inject persistent JavaScript or HTML content into the web application.

The specific flaw exists within the web portal listening on TCP port 443, under Configuration → Domains, specifically in the “Description” field. The application fails to properly validate or sanitize user-supplied input before storing and subsequently rendering the field.

By injecting malicious JavaScript into the Description field, an attacker can modify the content and behavior of the affected page when it is viewed by other users. This could allow an attacker to alter the page's appearance, display attacker-controlled content, or construct convincing phishing scenarios within the application's trusted web context.

Weakness: CWE-79

Which versions are affected by CVE-2026-104807?

How do I fix CVE-2026-104807?

No fix has been published for CVE-2026-104807 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-104807 being exploited?

There is no known exploitation of CVE-2026-104807 in the wild and no public exploit code.

Sources

Also known as GHSA-896c-xx42-4m9c.