CVE-2025-22243
📋 TL;DR
VMware NSX Manager UI has a stored XSS vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. This affects organizations using VMware NSX Manager for network virtualization and security management. Attackers could steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- VMware NSX Manager
📦 What is this software?
Vmware Nsx by Broadcom
Vmware Nsx by Broadcom
Vmware Nsx by Broadcom
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of NSX Manager administrative access leading to network infrastructure takeover, data exfiltration, or lateral movement to connected systems.
Likely Case
Session hijacking of NSX Manager administrators, allowing attackers to modify network policies, create backdoors, or disrupt network operations.
If Mitigated
Limited impact with proper input validation and output encoding in place, potentially only affecting UI display without code execution.
🎯 Exploit Status
Stored XSS typically requires some level of UI access or social engineering; exploitation is straightforward once malicious payload is injected
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check VMware advisory for specific patched versions
Vendor Advisory: https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25738
Restart Required: Yes
Instructions:
1. Review VMware advisory for affected versions. 2. Download and apply the latest NSX Manager patch from VMware. 3. Restart NSX Manager services. 4. Verify UI functionality post-patch.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation for UI fields that accept user input
Not applicable - requires code changes
Content Security Policy
linuxImplement strict CSP headers to restrict script execution
Add 'Content-Security-Policy' header to NSX Manager web server configuration
🧯 If You Can't Patch
- Restrict NSX Manager UI access to trusted networks only using firewall rules
- Implement web application firewall (WAF) with XSS protection rules in front of NSX Manager
🔍 How to Verify
Check if Vulnerable:
Check NSX Manager version against VMware advisory; test UI input fields for script injectionCheck Version:
ssh admin@nsx-manager-ip 'show version' or check via NSX Manager web interfaceVerify Fix Applied:
Verify NSX Manager version is updated to patched version; test previously vulnerable input fields📡 Detection & Monitoring
Log Indicators:
- Unusual script tags in UI input logs
- Multiple failed XSS attempts in web server logs
- Unexpected JavaScript execution in browser console
Network Indicators:
- Suspicious outbound connections from NSX Manager to external domains
- Unusual HTTP POST requests with script payloads
SIEM Query:
source="nsx-manager-logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")