CVE-2026-30529: Online Food Ordering System SQLi Flaw

CVE-2026-30529 Overview

A SQL Injection vulnerability exists in SourceCodester Online Food Ordering System v1.0 in the Actions.php file (specifically the save_user action). The application fails to properly sanitize user input supplied to the username parameter. This allows an authenticated attacker to inject malicious SQL commands, potentially leading to unauthorized data access, modification, or deletion of database contents.

Critical Impact

Authenticated attackers can exploit insufficient input sanitization in the save_user action to execute arbitrary SQL commands, potentially compromising the entire database including customer information, orders, and administrative credentials.

Affected Products

• Oretnom23 Online Food Ordering System v1.0
• SourceCodester Online Food Ordering System v1.0

Discovery Timeline

• 2026-03-27 - CVE CVE-2026-30529 published to NVD
• 2026-03-30 - Last updated in NVD database

Technical Details for CVE-2026-30529

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The Actions.php file in the Online Food Ordering System contains a save_user action that directly incorporates user-supplied input from the username parameter into SQL queries without proper sanitization or parameterization.

When processing user account creation or modification requests, the application constructs SQL queries by concatenating user input directly into the query string. This allows attackers to break out of the intended query structure and inject their own SQL commands. The network-accessible nature of this vulnerability combined with low attack complexity makes it particularly dangerous for internet-facing deployments.

Root Cause

The root cause of this vulnerability is the improper handling of user input in the save_user action within Actions.php. The application fails to implement parameterized queries (prepared statements) or adequate input validation and escaping mechanisms. Instead of treating user input as data, the application incorporates it directly into SQL command structures, allowing attackers to manipulate the query logic.

Attack Vector

An authenticated attacker can exploit this vulnerability by submitting a specially crafted username parameter to the save_user action endpoint. The attack requires network access to the vulnerable application and valid authentication credentials (low privileges). Since no user interaction is required beyond the attacker's own actions, the exploit can be automated.

The attacker can craft malicious input containing SQL metacharacters and commands that, when concatenated into the backend SQL query, will execute additional unauthorized database operations. This could include extracting sensitive data, modifying records, or potentially escalating privileges within the database system.

A proof of concept demonstrating this vulnerability is available in the GitHub PoC repository. The attack involves injecting SQL syntax through the username field during user save operations.

Detection Methods for CVE-2026-30529

Indicators of Compromise

• Unusual SQL error messages in application or web server logs indicating syntax errors or malformed queries
• Database query logs showing unexpected UNION SELECT, OR 1=1, or other SQL injection patterns in user-related queries
• Abnormal database access patterns from the web application service account, particularly bulk data extraction
• User accounts with usernames containing SQL metacharacters such as single quotes, semicolons, or comment sequences

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP request parameters
• Configure database audit logging to monitor for anomalous query patterns originating from the application
• Deploy intrusion detection signatures for common SQL injection attack payloads targeting the username parameter
• Monitor authentication and user management endpoints for requests containing SQL syntax characters

Monitoring Recommendations

• Enable detailed logging for the Actions.php endpoint, particularly the save_user action
• Set up alerts for database errors that indicate SQL syntax violations or injection attempts
• Monitor for unusual data access patterns that could indicate successful exploitation and data exfiltration
• Review access logs for repeated requests to user management functions with varying parameter values

How to Mitigate CVE-2026-30529

Immediate Actions Required

• Restrict network access to the Online Food Ordering System to trusted networks only until patching is possible
• Implement WAF rules to filter SQL injection patterns on all input parameters
• Review and audit all user accounts for signs of compromise or unauthorized creation
• Enable enhanced database logging to detect any ongoing exploitation attempts

Patch Information

No official vendor patch has been identified for this vulnerability at this time. SourceCodester applications are typically community-maintained, and users should monitor the GitHub PoC repository for updates and community-contributed fixes. Organizations using this software should consider implementing the code-level remediations described in the workarounds section.

Workarounds

• Implement prepared statements with parameterized queries in Actions.php for all database operations involving user input
• Add server-side input validation to reject usernames containing SQL metacharacters (single quotes, semicolons, dashes, comment sequences)
• Deploy a Web Application Firewall configured with SQL injection detection rules in front of the application
• Apply the principle of least privilege to the database account used by the application to limit potential damage from successful exploitation

# Example mitigation using prepared statements (PHP/MySQLi)
# Replace direct query concatenation with parameterized queries:

$stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $password);
$stmt->execute();