CVE-2025-47204
📋 TL;DR
This vulnerability in bootstrap-multiselect 1.1.2 allows attackers to execute arbitrary JavaScript code in users' browsers through reflected XSS. Developers who directly use the vulnerable post.php script in their web applications are affected. The vulnerability can be triggered via CSRF, potentially leading to session hijacking or malicious actions.
💻 Affected Systems
- bootstrap-multiselect
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user sessions, perform actions as authenticated users, redirect to malicious sites, or install malware via browser exploitation.
Likely Case
Session hijacking, credential theft, or unauthorized actions performed in the context of authenticated users.
If Mitigated
Limited impact with proper input validation, output encoding, and CSRF protections in place.
🎯 Exploit Status
Exploitation requires the vulnerable script to be accessible and the attacker to trick a user into visiting a malicious page or clicking a crafted link.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.3 or later
Vendor Advisory: https://github.com/davidstutz/bootstrap-multiselect/releases
Restart Required: No
Instructions:
1. Update bootstrap-multiselect to version 1.1.3 or later. 2. Replace the vulnerable post.php file with the patched version. 3. Test the application to ensure functionality is preserved.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation and output encoding in the application code to prevent XSS.
Remove Vulnerable Script
linuxRemove or disable the post.php script if it's not required for application functionality.
rm /path/to/post.php
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Deploy WAF rules to block XSS payloads and suspicious POST requests
🔍 How to Verify
Check if Vulnerable:
Check if post.php exists in the bootstrap-multiselect directory and if it echoes POST data without proper sanitization.Check Version:
Check the version in the bootstrap-multiselect files or package manager (e.g., composer show davidstutz/bootstrap-multiselect)Verify Fix Applied:
Verify the bootstrap-multiselect version is 1.1.3 or later and test that POST data is properly sanitized before output.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to post.php with JavaScript payloads
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in POST parameters
- Traffic patterns suggesting CSRF attacks
SIEM Query:
source="web_server" AND uri="*post.php*" AND (POST_data="*<script>*" OR POST_data="*javascript:*")