CVE-2025-27442
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Zoom Workplace Apps allows an unauthenticated attacker on the same network to inject malicious scripts into web pages. The vulnerability enables integrity loss by manipulating content that other users see, potentially leading to session hijacking or credential theft. All users of affected Zoom Workplace Apps versions are potentially impacted.
💻 Affected Systems
- Zoom Workplace Apps
📦 What is this software?
Rooms by Zoom
Rooms by Zoom
Rooms by Zoom
Rooms by Zoom
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal session cookies or authentication tokens, leading to account takeover, data exfiltration, or further network compromise.
Likely Case
Attackers inject malicious scripts to redirect users to phishing sites, display fake login prompts, or perform actions on behalf of authenticated users.
If Mitigated
With proper network segmentation and web application firewalls, the impact is limited to isolated network segments with minimal data exposure.
🎯 Exploit Status
Exploitation requires adjacent network access but no authentication; typical XSS exploitation techniques apply
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Zoom security bulletin ZSB-25013 for specific patched versions
Vendor Advisory: https://www.zoom.com/en/trust/security-bulletin/zsb-25013
Restart Required: Yes
Instructions:
1. Access Zoom admin portal
2. Navigate to Updates section
3. Apply latest security updates for Zoom Workplace Apps
4. Restart affected applications/services
🔧 Temporary Workarounds
Network Segmentation
allIsolate Zoom Workplace Apps to separate VLANs to limit adjacent network access
Web Application Firewall Rules
allImplement WAF rules to block common XSS payload patterns
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers for Zoom applications
- Deploy network monitoring for XSS attack patterns and block malicious IPs
🔍 How to Verify
Check if Vulnerable:
Check Zoom Workplace Apps version against affected versions in ZSB-25013 advisoryCheck Version:
Check within Zoom admin portal or application settings for version informationVerify Fix Applied:
Verify Zoom Workplace Apps version is updated to patched version listed in ZSB-25013📡 Detection & Monitoring
Log Indicators:
- Unusual script tags or JavaScript in Zoom application logs
- Multiple failed XSS attempts from same source
Network Indicators:
- HTTP requests containing suspicious script payloads to Zoom endpoints
- Unusual traffic patterns to Zoom applications from internal sources
SIEM Query:
source="zoom_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")