CVE-2025-25818
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Emlog Pro allows attackers to inject malicious scripts into blog posts via the postStrVar function. Attackers can steal session cookies, redirect users, or deface websites when users view compromised posts. This affects all Emlog Pro v2.5.4 installations with the vulnerable article_save.php file.
💻 Affected Systems
- Emlog Pro
📦 What is this software?
Emlog by Emlog
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover via session cookie theft, website defacement, credential harvesting from administrators, and malware distribution to visitors.
Likely Case
Session hijacking of logged-in users, website defacement through injected content, and potential credential theft from administrators.
If Mitigated
Limited to content manipulation within the blog post context if proper input validation and output encoding are implemented elsewhere.
🎯 Exploit Status
Exploitation requires authentication to access the article_save.php function. The GitHub reference contains proof-of-concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.emlog.net/
Restart Required: No
Instructions:
1. Check Emlog.net for official patches or updates. 2. If available, download the patched version. 3. Backup your current installation. 4. Replace vulnerable files with patched versions. 5. Clear any cached content.
🔧 Temporary Workarounds
Input Validation Sanitization
allAdd server-side input validation and output encoding to the postStrVar function in article_save.php
# Edit article_save.php and sanitize postStrVar input using htmlspecialchars() or similar functions
WAF Rule Implementation
allDeploy web application firewall rules to block XSS payloads targeting the article_save.php endpoint
# Add WAF rule: Detect and block scripts in POST parameters to article_save.php
🧯 If You Can't Patch
- Restrict access to the admin panel to trusted IP addresses only
- Implement Content Security Policy (CSP) headers to mitigate script execution impact
🔍 How to Verify
Check if Vulnerable:
Review article_save.php for lack of input sanitization in postStrVar function. Test by attempting to inject basic XSS payloads in blog post creation.Check Version:
Check Emlog Pro version in admin panel or examine version files in installation directoryVerify Fix Applied:
Verify that htmlspecialchars() or similar sanitization functions are applied to postStrVar input in article_save.php. Test that XSS payloads no longer execute.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to article_save.php with script tags or JavaScript payloads
- Multiple failed authentication attempts followed by successful article_save.php access
Network Indicators:
- HTTP requests containing <script> tags or JavaScript code in POST parameters to article_save.php endpoint
SIEM Query:
source="web_logs" AND uri="/article_save.php" AND (post_data="*<script>*" OR post_data="*javascript:*")