CVE-2025-25823
📋 TL;DR
This cross-site scripting vulnerability in Emlog Pro v2.5.4 allows attackers to inject malicious scripts into article headers via the admin interface. When exploited, it enables execution of arbitrary JavaScript in the context of authenticated users' browsers. This affects all Emlog Pro v2.5.4 installations with default configurations.
💻 Affected Systems
- Emlog Pro
📦 What is this software?
Emlog by Emlog
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal admin session cookies, perform account takeover, deface websites, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers with admin access could inject persistent XSS payloads that affect all users viewing articles, enabling session hijacking and privilege escalation.
If Mitigated
With proper input validation and output encoding, the risk is reduced to minimal, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Proof of concept available on GitHub, requires authenticated admin access
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.5.5 or later
Vendor Advisory: https://www.emlog.net/
Restart Required: No
Instructions:
1. Backup your Emlog Pro installation and database. 2. Download the latest version from emlog.net. 3. Replace all files except config.php and uploads directory. 4. Run update script if provided.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize article header input before processing
Modify /admin/article.php to include HTML entity encoding for user input
🧯 If You Can't Patch
- Restrict admin access to trusted IP addresses only
- Implement web application firewall (WAF) rules to block XSS payloads in article headers
🔍 How to Verify
Check if Vulnerable:
Check if Emlog Pro version is 2.5.4 by viewing admin dashboard or checking version.php fileCheck Version:
Check admin dashboard or view /admin/version.phpVerify Fix Applied:
After patching, attempt to inject basic XSS payload like <script>alert('test')</script> into article header and verify it's properly encoded📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /admin/article.php with script tags or JavaScript in parameters
- Multiple failed login attempts followed by successful admin login
Network Indicators:
- HTTP requests containing <script> tags in article header parameters
- Unusual outbound connections from admin sessions
SIEM Query:
source="web_logs" AND (url="/admin/article.php" AND (param="header" CONTAINS "<script>" OR param="header" CONTAINS "javascript:"))