CVE-2025-51487
📋 TL;DR
A stored XSS vulnerability in MoonShine versions before 3.12.5 allows attackers to inject malicious JavaScript via the CutCode Link parameter when creating/updating articles. This affects all MoonShine users running vulnerable versions, potentially compromising user sessions and data.
💻 Affected Systems
- MoonShine
📦 What is this software?
Moonshine by Moonshine
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal admin credentials, hijack user sessions, deface the application, or redirect users to malicious sites, leading to complete system compromise.
Likely Case
Attackers inject malicious scripts to steal session cookies or user data from authenticated users who view the compromised article.
If Mitigated
With proper input validation and output encoding, the impact is limited to minor UI disruption without data theft.
🎯 Exploit Status
Exploitation requires article creation/edit permissions. Proof-of-concept code is available in the referenced GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.12.5
Vendor Advisory: https://github.com/moonshine-software/moonshine
Restart Required: No
Instructions:
1. Update MoonShine to version 3.12.5 or later using composer update moonshine/moonshine. 2. Verify the update completed successfully. 3. Test article creation/editing functionality.
🔧 Temporary Workarounds
Input Validation Workaround
allImplement server-side validation to reject 'javascript:' protocol in link fields
Add validation in your MoonShine form handlers to check for 'javascript:' protocol and reject such inputs
🧯 If You Can't Patch
- Restrict article creation/editing permissions to trusted users only
- Implement WAF rules to block requests containing 'javascript:' in link parameters
🔍 How to Verify
Check if Vulnerable:
Check if MoonShine version is below 3.12.5 by examining composer.lock or running php artisan --versionCheck Version:
php artisan --version | grep -i moonshineVerify Fix Applied:
Confirm version is 3.12.5 or higher and test that 'javascript:' links are properly sanitized or rejected📡 Detection & Monitoring
Log Indicators:
- Unusual article creation/updates with suspicious link parameters
- Requests containing 'javascript:' in POST data
Network Indicators:
- HTTP requests with 'javascript:' in form parameters
- Unusual outbound connections from user browsers after viewing articles
SIEM Query:
source="web_logs" AND (url="*/articles/*" OR method="POST") AND (param="*javascript:*" OR body="*javascript:*")