CVE-2025-61183
📋 TL;DR
This cross-site scripting (XSS) vulnerability in VaahCMS v2.3.1 allows remote attackers to inject malicious scripts via avatar upload functionality. Attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies or performing actions on behalf of authenticated users. All VaahCMS v2.3.1 installations with the vulnerable UserBase.php component are affected.
💻 Affected Systems
- VaahCMS
📦 What is this software?
Vaahcms by Webreinvent
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full administrative access, deface websites, install backdoors, or pivot to internal systems.
Likely Case
Attackers steal user session cookies, perform account takeovers, redirect users to malicious sites, or capture sensitive form data.
If Mitigated
Script execution is contained within the upload context, limiting impact to specific user sessions or requiring additional social engineering.
🎯 Exploit Status
Exploitation requires the ability to upload files (typically authenticated users). GitHub repository contains proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.3.2 or later
Vendor Advisory: https://github.com/webreinvent/vaahcms/issues/301
Restart Required: No
Instructions:
1. Backup your current installation. 2. Update VaahCMS to v2.3.2 or later via composer: 'composer update webreinvent/vaahcms'. 3. Clear application cache. 4. Verify the fix by checking the UserBase.php file for proper input sanitization.
🔧 Temporary Workarounds
Disable Avatar Uploads
allTemporarily disable user avatar upload functionality to prevent exploitation.
Modify UserBase.php to remove or comment out storeAvatar() method
Disable avatar upload routes in your application configuration
Implement File Type Validation
allAdd strict file type validation to only allow image formats (jpg, png, gif) and reject HTML/JS files.
Add MIME type checking in storeAvatar() method
Implement file extension whitelisting
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block malicious file uploads containing script tags
- Enable Content Security Policy (CSP) headers to restrict script execution from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check if your VaahCMS version is 2.3.1. Review UserBase.php for lack of proper input sanitization in storeAvatar() method.Check Version:
php artisan vaahcms:version or check composer.json for 'webreinvent/vaahcms' versionVerify Fix Applied:
After updating, verify that uploaded files are properly validated and that script tags in uploaded content are sanitized or rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with non-image extensions
- Multiple failed upload attempts with suspicious filenames
- Uploads containing script tags or JavaScript code
Network Indicators:
- POST requests to avatar upload endpoints with unusual content types
- File uploads larger than typical avatar images
SIEM Query:
source="web_logs" AND (uri_path="/avatar/upload" OR uri_path="/user/avatar") AND (file_extension!="jpg" AND file_extension!="png" AND file_extension!="gif")