CVE-2026-37590: Storage Unit Rental System SQLi Flaw

CVE-2026-37590 Overview

A SQL Injection vulnerability has been identified in SourceCodester Storage Unit Rental Management System v1.0. The vulnerability exists in the file /storage/admin/rents/manage_rent.php, allowing authenticated attackers with administrative privileges to execute arbitrary SQL queries against the underlying database. This vulnerability falls under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).

Critical Impact

Authenticated administrators can exploit this SQL Injection flaw to extract sensitive information from the database, potentially exposing tenant data, rental agreements, and system configurations.

Affected Products

• SourceCodester Storage Unit Rental Management System v1.0

Discovery Timeline

• 2026-04-14 - CVE-2026-37590 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2026-37590

Vulnerability Analysis

This SQL Injection vulnerability affects the rental management functionality of the Storage Unit Rental Management System. The vulnerable endpoint /storage/admin/rents/manage_rent.php fails to properly sanitize user-supplied input before incorporating it into SQL queries. While the attack requires high privileges (administrative access) to exploit, it nonetheless allows unauthorized data extraction from the database.

The vulnerability is network-accessible and requires no user interaction, though its impact is limited to confidentiality concerns due to the read-only nature of the potential exploitation. The restricted scope means that the vulnerability cannot affect resources beyond the immediate vulnerable component.

Root Cause

The root cause of this vulnerability is improper input validation in the manage_rent.php file. User-controlled parameters are directly concatenated into SQL queries without proper sanitization or the use of parameterized queries. This allows attackers to inject malicious SQL syntax that alters the intended query logic.

Attack Vector

The attack is conducted over the network against the web application's administrative interface. An attacker with valid administrative credentials can manipulate input parameters sent to the manage_rent.php endpoint to inject SQL commands. Due to the requirement for administrative authentication, the attack surface is limited to privileged users or scenarios where administrative credentials have been compromised.

The vulnerability allows an attacker to craft requests containing SQL injection payloads that can bypass intended query constraints, enabling extraction of database contents such as user credentials, rental records, and system configuration data. For technical details and proof of concept, refer to the GitHub CVE Report.

Detection Methods for CVE-2026-37590

Indicators of Compromise

• Unusual SQL syntax patterns in web server access logs for /storage/admin/rents/manage_rent.php
• Database query logs showing unexpected UNION SELECT, OR 1=1, or other injection patterns
• Anomalous database read operations originating from the web application
• Administrative session activity with repeated requests to the vulnerable endpoint

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the manage_rent.php endpoint
• Enable detailed logging on the database server to capture and alert on suspicious query patterns
• Monitor for repeated authentication attempts followed by requests to the rental management functionality
• Deploy intrusion detection signatures for common SQL injection attack patterns

Monitoring Recommendations

• Configure real-time alerting for SQL error messages in application logs
• Monitor database audit logs for unauthorized data extraction attempts
• Track administrative user activity patterns for anomalous behavior
• Review web server logs for requests containing encoded SQL injection payloads

How to Mitigate CVE-2026-37590

Immediate Actions Required

• Restrict access to the administrative interface to trusted IP addresses only
• Implement additional authentication factors for administrative accounts
• Review and audit administrative user accounts for any unauthorized access
• Consider temporarily disabling the rental management functionality until a patch is available
• Deploy Web Application Firewall rules to filter SQL injection attempts

Patch Information

No official vendor patch has been released at this time. Users should monitor the GitHub CVE Report and SourceCodester's official channels for security updates. Given that this is a community-developed application, users may need to implement manual code fixes.

Workarounds

• Implement parameterized queries or prepared statements in the manage_rent.php file to prevent SQL injection
• Add input validation and sanitization for all user-supplied parameters in the affected file
• Deploy a Web Application Firewall (WAF) to filter malicious requests before they reach the application
• Limit database user privileges for the web application to reduce potential impact
• Isolate the application on a network segment with restricted access

# Example: Restrict access to admin directory via .htaccess
# Place this file in /storage/admin/ directory
<Files "manage_rent.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>