CVE-2025-6384
📋 TL;DR
This vulnerability allows authenticated developers in CrafterCMS to bypass Groovy sandbox restrictions and execute arbitrary operating system commands. Attackers can achieve remote code execution by inserting malicious Groovy elements. This affects CrafterCMS installations running versions 4.0.0 through 4.2.2.
💻 Affected Systems
- CrafterCMS Crafter Studio
📦 What is this software?
Craftercms by Craftercms
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the server, data exfiltration, lateral movement, and persistent backdoor installation.
Likely Case
Authenticated developers or attackers who compromise developer credentials can execute arbitrary commands, potentially leading to data theft, service disruption, or further network penetration.
If Mitigated
With proper access controls and network segmentation, impact could be limited to the application server, though data exposure remains possible.
🎯 Exploit Status
Exploitation requires authenticated developer access but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.2.3
Vendor Advisory: https://docs.craftercms.org/current/security/advisory.html#cv-2025061901
Restart Required: Yes
Instructions:
1. Backup your CrafterCMS installation and data. 2. Download version 4.2.3 or later from the official CrafterCMS repository. 3. Follow the upgrade instructions in the CrafterCMS documentation. 4. Restart the Crafter Studio service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Developer Access
allTemporarily remove or restrict developer access to Crafter Studio until patching can be completed.
Network Segmentation
allIsolate CrafterCMS servers from critical infrastructure and limit outbound connections.
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for all developer accounts
- Deploy application firewalls to monitor and block suspicious Groovy script execution patterns
🔍 How to Verify
Check if Vulnerable:
Check CrafterCMS version in administration panel or configuration files. Versions 4.0.0 through 4.2.2 are vulnerable.Check Version:
Check craftercms-version.txt in installation directory or view version in admin interfaceVerify Fix Applied:
Verify version is 4.2.3 or later. Check that Groovy sandbox restrictions are properly enforced in developer tools.📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy script execution patterns
- OS command execution attempts in application logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from CrafterCMS server
- Command and control traffic patterns
SIEM Query:
source="craftercms" AND (event="groovy_execution" OR event="command_execution")