CVE-2025-34157
9.0 CRITICAL
📋 TL;DR
Coolify versions before v4.0.0-beta.420.6 contain a stored XSS vulnerability where authenticated users can inject malicious JavaScript into project names. When administrators interact with these projects, the payload executes in their browser context, potentially compromising the entire Coolify instance. This affects all Coolify deployments running vulnerable versions.
💻 Affected Systems
Products:
- Coolify
Versions: All versions prior to v4.0.0-beta.420.6
Operating Systems: All platforms running Coolify
Default Config Vulnerable:
⚠️ Yes
Notes: Requires authenticated user access, but low-privilege users can exploit this vulnerability.
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Coolify instance including theft of administrator credentials, API tokens, session cookies, and unauthorized access to managed servers via WebSocket terminals, leading to full system takeover.
Likely Case
Attackers steal administrator credentials and API tokens, gaining persistent access to the Coolify instance and potentially compromising managed infrastructure.
If Mitigated
Limited impact with proper input validation and output encoding, potentially only affecting the specific administrator session.
🌐 Internet-Facing: HIGH
🏢 Internal Only: HIGH
🎯 Exploit Status
Public PoC:
⚠️ Yes
Weaponized:
LIKELY
Unauthenticated Exploit:
✅ No
Complexity:
LOW
Exploitation requires authenticated user access but is straightforward once access is obtained. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.0.0-beta.420.7
Vendor Advisory: https://github.com/coollabsio/coolify/releases/tag/v4.0.0-beta.420.7
Restart Required: Yes
Instructions:
1. Backup your Coolify instance and configuration. 2. Update to v4.0.0-beta.420.7 or later using the official upgrade process. 3. Restart the Coolify service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to reject project names containing JavaScript or HTML tags
Not applicable - requires code modification
Output Encoding
allApply proper output encoding when displaying project names in web interface
Not applicable - requires code modification
🧯 If You Can't Patch
- Restrict project creation to trusted administrators only
- Implement web application firewall (WAF) rules to detect and block XSS payloads in project names
🔍 How to Verify
Check if Vulnerable:
Check Coolify version in admin panel or via API. If version is below v4.0.0-beta.420.6, the system is vulnerable.Check Version:
Check Coolify admin dashboard or run: docker exec coolify cat /app/package.json | grep versionVerify Fix Applied:
After updating, verify version is v4.0.0-beta.420.7 or later and test project creation with suspicious names to ensure proper sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual project creation patterns
- Project names containing JavaScript or HTML tags
- Multiple failed deletion attempts
Network Indicators:
- Unexpected outbound connections from Coolify instance
- Suspicious WebSocket connections
SIEM Query:
source="coolify" AND (message="project created" OR message="project deleted") AND (name CONTAINS "<script>" OR name CONTAINS "javascript:")