CVE-2026-0583: Online Product Reservation System SQLi

CVE-2026-0583 Overview

A SQL injection vulnerability has been discovered in code-projects Online Product Reservation System version 1.0. This security flaw affects the file app/user/login.php within the User Login component. The vulnerability stems from improper handling of the emailadd parameter, allowing attackers to inject malicious SQL commands. The attack can be launched remotely without authentication, and an exploit has been publicly released, increasing the risk of active exploitation.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive database information, modify or delete data, and potentially gain unauthorized access to the underlying system.

Affected Products

• code-projects Online Product Reservation System 1.0
• User Login Component (app/user/login.php)

Discovery Timeline

• 2026-01-05 - CVE-2026-0583 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-0583

Vulnerability Analysis

This SQL injection vulnerability exists in the User Login functionality of the Online Product Reservation System. The emailadd parameter in app/user/login.php does not properly sanitize user-supplied input before incorporating it into SQL queries. This allows an attacker to inject arbitrary SQL statements that will be executed by the database server.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws where user input is not adequately validated or sanitized before being processed.

Root Cause

The root cause is insufficient input validation and the likely use of unsanitized user input directly in SQL queries. The emailadd parameter accepts user-controlled data that is concatenated directly into SQL statements without proper parameterization or escaping. This classic SQL injection pattern allows attackers to break out of the intended query structure and execute arbitrary database commands.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can craft a malicious HTTP request to the login.php endpoint containing SQL injection payloads in the emailadd parameter. Successful exploitation could allow:

• Authentication bypass by manipulating login queries
• Extraction of sensitive data from the database (usernames, passwords, personal information)
• Modification or deletion of database records
• Potential escalation to command execution depending on database configuration

The vulnerability is remotely exploitable, and the public availability of exploit code significantly lowers the barrier to exploitation. For technical details and proof of concept, refer to the GitHub CVE Documentation.

Detection Methods for CVE-2026-0583

Indicators of Compromise

• Anomalous HTTP POST requests to /app/user/login.php containing SQL syntax characters such as single quotes, double quotes, semicolons, or SQL keywords (UNION, SELECT, OR, AND) in the emailadd field
• Database error messages appearing in web server logs or application responses
• Unusual database queries in database audit logs, particularly those with UNION-based or time-based blind SQL injection patterns
• Successful logins from unexpected IP addresses or geographic locations

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP parameters
• Monitor application logs for repeated failed login attempts with unusual parameter values
• Implement database activity monitoring to detect anomalous query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) with signatures for SQL injection attack patterns targeting PHP applications

Monitoring Recommendations

• Enable verbose logging on the web server and database to capture all queries executed against user tables
• Set up alerts for database errors that may indicate SQL injection attempts (syntax errors, type mismatches)
• Monitor for unusual data exfiltration patterns or bulk data access from the reservation system database
• Review authentication logs for successful logins that bypass normal validation patterns

How to Mitigate CVE-2026-0583

Immediate Actions Required

• Restrict access to the affected login page (app/user/login.php) to trusted IP ranges if possible
• Deploy WAF rules to filter SQL injection payloads targeting the emailadd parameter
• Consider temporarily disabling the vulnerable login functionality until a proper fix is implemented
• Review database user permissions to ensure the application account has minimal required privileges

Patch Information

As of the last update on 2026-01-08, no official vendor patch has been released for this vulnerability. Organizations using code-projects Online Product Reservation System 1.0 should monitor the Code Projects Resource Hub for security updates. Additional technical information is available through VulDB #339475.

Workarounds

• Implement parameterized queries (prepared statements) in the login.php file to prevent SQL injection
• Add server-side input validation to sanitize the emailadd parameter, rejecting inputs containing SQL metacharacters
• Deploy a Web Application Firewall with SQL injection detection rules in front of the application
• Apply the principle of least privilege to database accounts used by the application, limiting permissions to only necessary operations

Organizations should consider modifying the vulnerable code to use PDO or MySQLi prepared statements. Example secure implementation pattern for PHP applications:

# Secure parameterized query pattern (recommended fix approach)
# Replace direct SQL concatenation with prepared statements
$stmt = $pdo->prepare("SELECT * FROM users WHERE email = :email");
$stmt->execute(['email' => $emailadd]);