CVE-2025-70092: OpenSourcePOS v3.4.1 XSS Vulnerability

CVE-2025-70092 Overview

A cross-site scripting (XSS) vulnerability has been identified in the Item Kits function of OpenSourcePOS v3.4.1. This vulnerability allows attackers to execute arbitrary web scripts or HTML by injecting a crafted payload into the Item Name parameter. XSS vulnerabilities of this nature can lead to session hijacking, credential theft, and unauthorized actions performed on behalf of authenticated users.

Critical Impact

Attackers can inject malicious scripts through the Item Name parameter in the Item Kits function, potentially compromising user sessions and enabling data theft or unauthorized actions within the OpenSourcePOS application.

Affected Products

• OpenSourcePOS v3.4.1

Discovery Timeline

• 2026-02-12 - CVE CVE-2025-70092 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2025-70092

Vulnerability Analysis

This stored XSS vulnerability exists within the Item Kits functionality of OpenSourcePOS, a widely-used open-source point of sale application. The vulnerability occurs due to insufficient input validation and output encoding when processing the Item Name parameter. When a user creates or modifies an item kit, the application fails to properly sanitize user-supplied input before storing it in the database and subsequently rendering it in the web interface.

The vulnerability is particularly concerning in retail environments where multiple users may interact with the POS system. An attacker with access to create item kits could inject malicious JavaScript that executes in the context of other users' browsers when they view the compromised item kit entries.

Root Cause

The root cause of this vulnerability is improper input sanitization and missing output encoding in the Item Kits module. The application accepts user input for the Item Name parameter without validating or sanitizing special characters commonly used in XSS attacks, such as <, >, ", and '. Furthermore, when rendering the stored item names in the user interface, the application does not apply proper HTML entity encoding, allowing injected scripts to execute in the browser context.

Attack Vector

The attack vector involves an authenticated user with permissions to create or modify item kits. The attacker crafts a malicious payload containing JavaScript code and inserts it into the Item Name field when creating a new item kit or editing an existing one. When other users—including administrators—view the item kit listing or details page, the malicious script executes in their browser session.

This can lead to several attack scenarios including:

• Session cookie theft enabling account takeover
• Keylogging to capture sensitive input data
• Phishing attacks through injected fake login forms
• Unauthorized transactions performed using the victim's privileges
• Defacement of the POS interface

Technical details regarding the specific exploitation methodology can be found in the CVE Research Document published by the security researcher.

Detection Methods for CVE-2025-70092

Indicators of Compromise

• Unusual JavaScript code or HTML tags stored in item kit names within the database
• Unexpected <script> tags, event handlers (e.g., onerror, onload, onclick), or encoded payloads in Item Name fields
• Browser console errors indicating blocked inline scripts (if CSP is partially implemented)
• Reports of unusual behavior when viewing item kit pages

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payload patterns in POST requests to item kit endpoints
• Enable application logging to capture and alert on suspicious characters in form submissions
• Deploy browser-based XSS detection using Content Security Policy violation reporting
• Conduct regular database audits scanning for stored XSS patterns in the item_kits table

Monitoring Recommendations

• Monitor HTTP request logs for unusual payloads containing script tags or JavaScript event handlers targeting the Item Kits functionality
• Set up alerts for database entries containing potentially malicious HTML or JavaScript patterns
• Review application access logs for unusual patterns of item kit creation or modification
• Implement real-time monitoring for CSP violation reports to identify exploitation attempts

How to Mitigate CVE-2025-70092

Immediate Actions Required

• Audit existing item kit entries in the database for any stored XSS payloads and sanitize or remove malicious content
• Implement strict input validation on the Item Name parameter to reject special characters used in XSS attacks
• Apply output encoding using HTML entity encoding when rendering item names in the web interface
• Consider restricting item kit creation/modification permissions to trusted administrators until a patch is applied

Patch Information

At the time of publication, users should monitor the official OpenSourcePOS repository and security channels for patch releases addressing this vulnerability. The GitHub CVE Research Document may contain additional guidance on remediation steps.

Workarounds

• Implement a Content Security Policy (CSP) header to restrict inline script execution and mitigate XSS impact
• Deploy a Web Application Firewall (WAF) with rules configured to block common XSS payloads
• Manually sanitize the Item Name input using server-side validation before database storage
• Limit user permissions for creating and modifying item kits to reduce the attack surface

# Example CSP header configuration for Apache
# Add to .htaccess or virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'none';"