CVE-2025-12107
📋 TL;DR
This critical vulnerability allows attackers with admin privileges to inject and execute arbitrary template code in server-side templates due to a vulnerable Velocity template engine. This affects systems using the vulnerable third-party Velocity template engine with admin access enabled. Successful exploitation could lead to remote code execution, data manipulation, or unauthorized access.
💻 Affected Systems
- WSO2 products using vulnerable Velocity template engine
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized data access and manipulation, potential privilege escalation beyond admin level, and system instability.
If Mitigated
Limited impact due to proper access controls, network segmentation, and monitoring preventing successful exploitation.
🎯 Exploit Status
Exploitation requires admin credentials; template injection is well-documented attack vector
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check WSO2 security advisory for specific patched versions
Vendor Advisory: https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4517/
Restart Required: Yes
Instructions:
1. Review WSO2 security advisory 2. Apply recommended patches 3. Update Velocity template engine 4. Restart affected services 5. Verify fix implementation
🔧 Temporary Workarounds
Restrict Admin Access
allLimit admin privileges to essential personnel only and implement multi-factor authentication
Template Input Validation
allImplement strict input validation and sanitization for template parameters
🧯 If You Can't Patch
- Implement network segmentation to isolate affected systems
- Enable detailed logging and monitoring for template injection attempts
🔍 How to Verify
Check if Vulnerable:
Check system logs for Velocity template engine version and compare against vendor advisoryCheck Version:
Check application logs or configuration files for Velocity engine versionVerify Fix Applied:
Verify Velocity template engine has been updated to patched version and test template functionality📡 Detection & Monitoring
Log Indicators:
- Unusual template syntax in logs
- Admin user performing unexpected template operations
- Velocity engine error messages
Network Indicators:
- Unusual outbound connections from template processing systems
- Large data transfers following template operations
SIEM Query:
source="application_logs" AND ("Velocity" OR "template") AND ("inject" OR "execute" OR "malicious")