---
id: CVE-2026-104808
title: >-
  DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability
  that allows an authenticated malicious user to inject persistent JavaScript or
  HTML content, resulting in a denial-of-service condition within the web
  applica…
summary: >-
  DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability
  that allows an authenticated malicious user to inject persistent JavaScript or
  HTML content, resulting in a denial-of-service condition within the web
  applica…
severity: low
cvss: 1.9
cvssVector: >-
  CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:P/AU:Y/R:A/V:D/RE:L/U:Amber
cwe:
  - CWE-79
vendor: Mitel
product: Mitel MiVoice Office 400
affected:
  - mivoice_office_400 11.0.96.0
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T09:17:09.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104808'
references:
  - url: 'https://digitalcanion.com/en/security-research/#vendor=mitel&status=cna'
    label: vulnerability@ncsc.ch
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-05T09:16:17.872Z'
---

## Overview

DigitalCanion has discovered a stored Cross-Site Scripting (XSS) vulnerability that allows an authenticated malicious user to inject persistent JavaScript or HTML content, resulting in a denial-of-service condition within the web application.




The specific flaw exists within the web portal listening on TCP port 443, under Configuration → Users → Users List. The vulnerability occurs in the “Microsoft Exchange mailbox” field, which fails to properly validate or sanitize user-supplied input before storing and rendering it.




By injecting malicious JavaScript into this field, an attacker can cause the payload to execute whenever the affected user properties are accessed. This can prevent access to the affected user properties and result in a denial-of-service condition within the application's user-management functionality.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.