CVE-2025-67823
📋 TL;DR
An unauthenticated cross-site scripting (XSS) vulnerability in Mitel's Multimedia Email component allows attackers to execute arbitrary scripts in victims' browsers or desktop clients when users interact with malicious emails. This affects Mitel MiContact Center Business up to version 10.2.0.10 and Mitel CX up to version 1.1.0.1. The vulnerability requires the email channel to be enabled and user interaction to trigger.
💻 Affected Systems
- Mitel MiContact Center Business
- Mitel CX
📦 What is this software?
Cx by Mitel
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of user sessions, credential theft, installation of malware, or redirection to malicious sites leading to full account takeover.
Likely Case
Session hijacking, cookie theft, phishing attacks, or defacement of the email interface.
If Mitigated
Limited impact with proper input validation, content security policies, and user awareness training.
🎯 Exploit Status
Exploitation requires user interaction but no authentication, making it accessible to external attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-misa-2025-0010
Restart Required: Yes
Instructions:
1. Review Mitel security advisory MISA-2025-0010. 2. Apply vendor-provided patches. 3. Restart affected services. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable Email Channel
allTemporarily disable the Multimedia Email component if not essential.
Consult Mitel documentation for channel-specific disable commands
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy' header with appropriate directives
🧯 If You Can't Patch
- Implement network segmentation to isolate affected systems from untrusted networks.
- Deploy web application firewall (WAF) rules to block XSS payloads in email content.
🔍 How to Verify
Check if Vulnerable:
Check system version against affected ranges: MiContact Center Business ≤10.2.0.10 or Mitel CX ≤1.1.0.1.Check Version:
Consult Mitel administration interface or documentation for version check commands.Verify Fix Applied:
Verify installed version exceeds affected ranges and test email functionality with safe XSS payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual email content patterns
- Script tags or JavaScript in email logs
- Unexpected redirects from email links
Network Indicators:
- HTTP requests with XSS payloads to email endpoints
- Suspicious outbound connections from client browsers
SIEM Query:
Search for 'script', 'javascript:', or 'onload=' in email-related HTTP logs.