CVE-2026-0590: Product Reservation System SQLi Vulnerability

CVE-2026-0590 Overview

A SQL injection vulnerability has been identified in code-projects Online Product Reservation System 1.0. The vulnerability exists in the /app/checkout/delete.php file within the POST Parameter Handler component. By manipulating the ID argument, an attacker can inject malicious SQL commands, potentially gaining unauthorized access to the database. This vulnerability can be exploited remotely over the network, and a public exploit has been disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract, modify, or delete sensitive database content, potentially compromising the entire reservation system and any stored customer data.

Affected Products

• code-projects Online Product Reservation System 1.0
• POST Parameter Handler component in /app/checkout/delete.php

Discovery Timeline

• 2026-01-05 - CVE-2026-0590 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-0590

Vulnerability Analysis

This vulnerability falls under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection vulnerabilities where user-controlled input is not properly sanitized before being used in sensitive operations.

The affected component is the delete.php file located at /app/checkout/delete.php, which handles POST request parameters. When the application processes the ID parameter, it fails to properly sanitize or parameterize the input before incorporating it into SQL queries. This allows an attacker to craft malicious input that alters the intended SQL command structure.

The vulnerability can be exploited remotely through the network without requiring user interaction, making it accessible to any attacker who can reach the application endpoint. An authenticated user with low privileges can exploit this vulnerability to perform unauthorized database operations.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries in the /app/checkout/delete.php file. The application directly incorporates user-supplied data from the ID POST parameter into SQL queries without proper sanitization or escaping. This classic SQL injection pattern occurs when developers concatenate user input directly into SQL statements rather than using prepared statements with bound parameters.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can send specially crafted POST requests to the /app/checkout/delete.php endpoint with malicious SQL code in the ID parameter. The exploit has been publicly disclosed, increasing the risk of active exploitation.

The attack requires low privileges (authentication) but does not require user interaction. Upon successful exploitation, the attacker can potentially read sensitive data from the database, modify or delete records, or in some configurations, execute administrative operations on the database server.

For technical details and proof of concept information, refer to the GitHub CVE Documentation.

Detection Methods for CVE-2026-0590

Indicators of Compromise

• Unusual SQL syntax patterns in web server logs targeting /app/checkout/delete.php
• Anomalous POST requests with special characters (single quotes, semicolons, SQL keywords) in the ID parameter
• Database error messages appearing in application responses indicating SQL syntax errors
• Unexpected database queries or access patterns originating from the web application

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in POST parameters
• Implement application-level logging to capture all requests to the /app/checkout/delete.php endpoint
• Configure database query auditing to identify anomalous queries from the application account
• Use intrusion detection systems (IDS) with signatures for SQL injection attack patterns

Monitoring Recommendations

• Monitor web server access logs for repeated requests to /app/checkout/delete.php with unusual parameter values
• Set up alerts for database errors or exceptions originating from the checkout component
• Review database audit logs for unauthorized data access or modifications
• Track authentication patterns for accounts making requests to the vulnerable endpoint

How to Mitigate CVE-2026-0590

Immediate Actions Required

• Restrict network access to the Online Product Reservation System to trusted IP ranges if possible
• Implement input validation on the ID parameter to accept only numeric values
• Deploy a Web Application Firewall with SQL injection protection rules
• Consider temporarily disabling the /app/checkout/delete.php functionality until a proper fix is implemented

Patch Information

No official vendor patch information is currently available for this vulnerability. Organizations should contact the developer through the Code Projects website for updates on security fixes. In the absence of an official patch, implementing the workarounds and defensive measures described below is strongly recommended.

Additional vulnerability details are available at VulDB #339500.

Workarounds

• Implement parameterized queries (prepared statements) in the delete.php file to prevent SQL injection
• Add server-side input validation to ensure the ID parameter contains only expected numeric values
• Apply the principle of least privilege to the database account used by the application
• Consider implementing a custom PHP wrapper that sanitizes all POST inputs before they reach the application logic

# Example: Apache mod_security rule to block SQL injection attempts
# Add to your Apache configuration or .htaccess file
SecRule ARGS:ID "(?i)(select|union|insert|update|delete|drop|--|;)" \
    "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt Blocked'"