CVE-2025-70093
📋 TL;DR
This vulnerability in OpenSourcePOS v3.4.1 allows attackers to execute arbitrary code on the server by sending a specially crafted AJAX response. This affects all systems running the vulnerable version of OpenSourcePOS, potentially compromising the entire point-of-sale system and associated data.
💻 Affected Systems
- OpenSourcePOS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the OpenSourcePOS server, allowing data theft, financial fraud, and lateral movement to other systems.
Likely Case
Attacker executes malicious code to steal sensitive data (customer information, payment details), disrupt POS operations, or install backdoors for persistent access.
If Mitigated
With proper network segmentation and input validation, impact limited to isolated POS system with no access to other business systems.
🎯 Exploit Status
Exploitation requires the ability to craft and send AJAX responses to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.4.2 or later
Vendor Advisory: https://github.com/opensourcepos/opensourcepos/pull/4357
Restart Required: No
Instructions:
1. Backup your OpenSourcePOS installation and database. 2. Update to OpenSourcePOS v3.4.2 or later via the built-in updater or manual installation. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation for AJAX responses to prevent malicious payloads from being processed.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the OpenSourcePOS system from other critical infrastructure
- Deploy a web application firewall (WAF) with rules to detect and block malicious AJAX response patterns
🔍 How to Verify
Check if Vulnerable:
Check the OpenSourcePOS version in the admin panel or by examining the application files for version 3.4.1.Check Version:
Check the version.php file in the OpenSourcePOS installation directory or use the admin panel's system info section.Verify Fix Applied:
Verify the version has been updated to 3.4.2 or later in the admin panel or application files.📡 Detection & Monitoring
Log Indicators:
- Unusual AJAX requests with suspicious payloads
- Unexpected process executions from the OpenSourcePOS application
Network Indicators:
- Abnormal outbound connections from the OpenSourcePOS server
- Unusual traffic patterns to/from the POS system
SIEM Query:
source="opensourcepos" AND (event_type="ajax_request" AND payload CONTAINS suspicious_patterns)