CVE-2025-56379
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in ERPNEXT v15.67.0 allows attackers to inject malicious scripts into blog posts, which execute when other users view the compromised content. This affects all ERPNEXT instances running the vulnerable version with blog functionality enabled. Attackers could steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- ERPNEXT
📦 What is this software?
Erpnext by Frappe
Frappe by Frappe
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain full system access, pivot to internal networks, and compromise sensitive business data.
Likely Case
Attackers steal user session cookies to hijack accounts, deface blog content, or redirect users to malicious sites.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before execution, preventing exploitation.
🎯 Exploit Status
Exploitation requires ability to create or edit blog posts. Public proof-of-concept available in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
1. Monitor ERPNEXT security advisories for patch release. 2. Apply patch when available. 3. Test in staging environment before production deployment.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation to sanitize blog post content and encode output to prevent script execution.
Implement content filtering in blog post handlers
Apply HTML encoding to user-generated content before display
Content Security Policy (CSP)
allImplement strict CSP headers to restrict script execution sources and prevent inline script execution.
Add Content-Security-Policy header to web server configuration
Example: Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Disable blog post creation/editing for untrusted users
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Test by creating a blog post with <script>alert('XSS')</script> payload and checking if script executes when viewed.Check Version:
Check ERPNEXT version in admin panel or via frappe --version commandVerify Fix Applied:
After applying fixes, test with same XSS payload to confirm script does not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual blog post creation/editing patterns
- Posts containing script tags or JavaScript code
Network Indicators:
- HTTP requests with suspicious script payloads in POST data
SIEM Query:
source="web_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=") AND uri="*/blog/*"