CVE-2025-62523
📋 TL;DR
PILOS before version 4.8.0 has a CORS misconfiguration that reflects the Origin header without validation while allowing credentials. This could theoretically allow malicious websites to make cross-origin authenticated requests, but Laravel's session protections make exploitation unlikely in typical deployments. Only PILOS instances running versions before 4.8.0 are affected.
💻 Affected Systems
- PILOS (Platform for Interactive Live-Online Seminars)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
If combined with other vulnerabilities bypassing Laravel's session protections, an attacker could perform authenticated actions or exfiltrate data using victim credentials via malicious cross-origin requests.
Likely Case
Minimal impact due to Laravel's built-in session origin checks preventing cross-origin authentication by default. The CORS misconfiguration alone is not exploitable.
If Mitigated
No impact when running PILOS 4.8.0+ or when Laravel's session protections remain intact.
🎯 Exploit Status
Exploitation requires bypassing Laravel's session origin checks, which are enabled by default and provide strong protection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.8.0
Vendor Advisory: https://github.com/THM-Health/PILOS/security/advisories/GHSA-pgfw-f4mp-5445
Restart Required: No
Instructions:
1. Update PILOS to version 4.8.0 or later. 2. Follow standard PILOS update procedures from the vendor documentation.
🔧 Temporary Workarounds
Implement CORS middleware whitelist
allManually configure CORS middleware to only allow specific trusted origins instead of reflecting arbitrary origins.
🧯 If You Can't Patch
- Ensure Laravel's session origin protection remains enabled and properly configured.
- Implement web application firewall rules to block suspicious cross-origin requests.
🔍 How to Verify
Check if Vulnerable:
Check PILOS version via web interface or configuration files. Versions before 4.8.0 are vulnerable.Check Version:
Check PILOS configuration files or web interface for version information.Verify Fix Applied:
Confirm PILOS version is 4.8.0 or later. Test CORS behavior by sending requests with different Origin headers.📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests with varied Origin headers
- Failed authentication attempts from unexpected origins
Network Indicators:
- HTTP requests with Origin headers pointing to non-trusted domains
- CORS preflight requests to PILOS API endpoints
SIEM Query:
http.request.method IN ("GET", "POST", "OPTIONS") AND http.headers.origin CONTAINS "http" AND NOT http.headers.origin CONTAINS "trusted-domain.com"