CVE-2025-66924
📋 TL;DR
This Cross-site scripting (XSS) vulnerability in Open Source Point of Sale allows attackers to inject malicious scripts into the 'name' parameter when creating or updating item kits. This affects users of Open Source Point of Sale v3.4.1 who have web access to the application. Successful exploitation could lead to session hijacking, data theft, or unauthorized actions.
💻 Affected Systems
- Open Source Point of Sale
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full control of the POS system, modifies pricing, steals customer payment data, or installs backdoors.
Likely Case
Attacker steals user session cookies to perform unauthorized transactions, modify inventory, or access sensitive business data.
If Mitigated
Script execution is blocked by Content Security Policy or input validation, limiting impact to minor UI disruption.
🎯 Exploit Status
Exploitation requires authenticated access to the Create/Update Item Kit feature. Public proof-of-concept exists in the referenced GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/opensourcepos/opensourcepos
Restart Required: No
Instructions:
1. Monitor the official Open Source Point of Sale repository for security updates. 2. Apply any future patches that address CVE-2025-66924. 3. Consider upgrading to newer versions if available.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize the 'name' parameter by removing or encoding HTML/JavaScript characters.
Content Security Policy
allImplement a strict Content Security Policy header to prevent inline script execution and restrict script sources.
🧯 If You Can't Patch
- Restrict access to the Create/Update Item Kit functionality to trusted administrators only.
- Implement a Web Application Firewall (WAF) with XSS protection rules to filter malicious payloads.
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject script payloads into the 'name' parameter when creating/updating item kits and checking if they execute.Check Version:
Check the application version in the admin interface or configuration files.Verify Fix Applied:
Verify that script payloads in the 'name' parameter are properly sanitized and do not execute in the browser.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to item kit creation/update endpoints with script-like content in parameters.
Network Indicators:
- HTTP requests containing script tags or JavaScript code in the 'name' parameter.
SIEM Query:
web.url:*item_kit* AND (web.param.name:*script* OR web.param.name:*javascript:* OR web.param.name:*onerror=*)