CVE-2025-53923
📋 TL;DR
Emlog website building system contains a cross-site scripting (XSS) vulnerability in the keyword parameter that allows attackers to inject malicious JavaScript. This affects all emlog users up to pro-2.5.17, particularly administrators who could be tricked into clicking malicious links. Successful exploitation allows arbitrary JavaScript execution in the victim's browser context.
💻 Affected Systems
- emlog
📦 What is this software?
Emlog by Emlog
⚠️ Risk & Real-World Impact
Worst Case
Administrator account compromise leading to complete website takeover, data theft, or malware distribution to visitors.
Likely Case
Session hijacking, credential theft, or defacement of the emlog installation.
If Mitigated
Limited impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation requires social engineering to trick users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://github.com/emlog/emlog/security/advisories/GHSA-vvx2-m94x-f54m
Restart Required: No
Instructions:
No official patch available. Monitor emlog repository for updates and apply immediately when released.
🔧 Temporary Workarounds
Input Sanitization
allAdd input validation and output encoding for the keyword parameter
Manual code modification required - locate keyword parameter handling and implement proper sanitization
WAF Rule
allImplement web application firewall rules to block XSS payloads in keyword parameter
Depends on specific WAF solution
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to limit script execution
- Restrict admin panel access to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check emlog version in admin panel or by examining source filesCheck Version:
Check admin panel or examine emlog version in source codeVerify Fix Applied:
Test keyword parameter with XSS payloads after implementing workarounds📡 Detection & Monitoring
Log Indicators:
- Unusual keyword parameter values containing script tags or JavaScript
Network Indicators:
- HTTP requests with keyword parameter containing suspicious payloads
SIEM Query:
web_requests WHERE parameter='keyword' AND (value CONTAINS '<script' OR value CONTAINS 'javascript:' OR value CONTAINS 'onload=')