Listen to this Post
The CVE-2025-66206 vulnerability is a path traversal issue in the Frappe web framework. It affects versions before 15.86.0 and 14.99.2. When Frappe is run directly with werkzeug or gunicorn without a reverse proxy, certain request handlers fail to properly sanitize user-input file paths. Attackers can exploit this by crafting HTTP requests containing directory traversal sequences like “../” or “..\”. These sequences allow accessing files outside the intended web root directory. For example, a request to “/../../etc/passwd” could retrieve system files. The vulnerability exists due to insufficient path validation in static file serving or routing logic. It enables unauthorized reading of sensitive server files, including configuration files, environment files, source code, and credentials. The flaw is particularly critical in default development deployments. Fixed versions implement robust path normalization, preventing traversal beyond allowed directories. Sites behind reverse proxies like NGINX are unaffected as the proxy blocks such malicious requests. Exploitation requires knowledge of the full file path on the server. The fix was applied in Frappe 15.86.0 and 14.99.2 through improved security checks.
Platform: Frappe
Version: Before 15.86.0, 14.99.2
Vulnerability: Path Traversal
Severity: Critical
Date: 12/01/2025
Prediction: Patched in 15.86.0
What Undercode Say:
Analytics:
bash: curl “http://target:8000/../../etc/passwd”
bash: wget “http://target/../config.json”
code: python3 -c “import requests; print(requests.get(‘http://target:8000/../../frappe.conf’).text)”
how Exploit:
Craft malicious HTTP requests with traversal sequences to access arbitrary files.
Protection from this CVE:
Upgrade to patched versions or use reverse proxy.
Impact:
Unauthorized file disclosure, data exposure.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
