CVE-2026-39111: Apartment Visitors Management SQL Injection

CVE-2026-39111 Overview

A SQL Injection vulnerability has been identified in Apartment Visitors Management System V1.1. The vulnerability exists in the email parameter of the forgot password page (forgot-password.php). This flaw allows an unauthenticated attacker to manipulate backend SQL queries and retrieve sensitive user data from the application database.

Critical Impact

Unauthenticated attackers can exploit this SQL Injection vulnerability to extract sensitive user data, including credentials and personal information, from the Apartment Visitors Management System database.

Affected Products

• Apartment Visitors Management System V1.1
• PHP Gurukul Apartment Visitors Management System (PHP/MySQL)

Discovery Timeline

• 2026-04-20 - CVE CVE-2026-39111 published to NVD
• 2026-04-20 - Last updated in NVD database

Technical Details for CVE-2026-39111

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) affects the password recovery functionality of the Apartment Visitors Management System. The forgot-password.php endpoint fails to properly sanitize user-supplied input in the email parameter before incorporating it into SQL queries. This lack of input validation allows attackers to inject malicious SQL statements that are executed against the backend database.

The vulnerability is particularly concerning because it exists in an authentication-related endpoint that is accessible without prior authentication. An attacker can craft malicious requests to the forgot password functionality to extract sensitive information from the database, potentially including user credentials, personal information, and other confidential data stored in the system.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries or prepared statements in the forgot-password.php file. The application directly concatenates user-supplied input from the email parameter into SQL queries without proper sanitization or escaping. This allows attackers to break out of the intended SQL context and inject arbitrary SQL commands.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can send specially crafted HTTP requests to the forgot-password.php endpoint with malicious SQL payloads in the email parameter. The vulnerability can be exploited remotely, making it accessible to any attacker who can reach the web application. Common exploitation techniques include UNION-based injection to extract data, boolean-based blind injection to infer database contents, and time-based blind injection for scenarios where direct output is not visible.

The attack can be performed by submitting a malicious email value such as ' OR '1'='1' -- or more sophisticated payloads designed to extract specific database tables and columns. The attacker can leverage standard SQL injection techniques to enumerate the database schema and extract sensitive user data.

Detection Methods for CVE-2026-39111

Indicators of Compromise

• Unusual or malformed HTTP POST requests to forgot-password.php containing SQL syntax characters such as single quotes, double dashes, UNION keywords, or semicolons
• Web application logs showing repeated requests to the password recovery endpoint with varying email parameter values
• Database logs indicating unusual query patterns, errors, or queries accessing multiple tables unexpectedly
• Evidence of data exfiltration through error-based or time-based SQL injection techniques

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in the email parameter
• Monitor web server access logs for suspicious patterns targeting forgot-password.php with encoded or obfuscated payloads
• Implement database query logging to identify anomalous SQL statements originating from the web application
• Use SentinelOne Singularity Platform to detect post-exploitation activities that may follow successful SQL injection attacks

Monitoring Recommendations

• Enable detailed logging on the web server and database server to capture all requests and queries
• Set up alerts for high-frequency requests to authentication endpoints such as forgot-password.php
• Monitor for unusual database access patterns or queries that return large result sets unexpectedly
• Implement real-time log analysis to correlate web requests with database activity

How to Mitigate CVE-2026-39111

Immediate Actions Required

• Remove or disable the forgot-password.php functionality until a patched version is available
• Implement input validation and sanitization for the email parameter immediately
• Deploy WAF rules to block SQL injection attempts targeting the affected endpoint
• Review database logs for evidence of prior exploitation and assess potential data exposure

Patch Information

As of the last update, no official vendor patch has been released. System administrators should monitor the PHP Gurukul Management System Overview page for security updates. Additional vulnerability details and proof-of-concept information may be available at the GitHub CVE Repository.

Workarounds

• Implement parameterized queries or prepared statements in the forgot-password.php file to prevent SQL injection
• Use PHP's PDO or MySQLi with prepared statements for all database interactions
• Restrict access to the forgot password functionality using IP-based access controls or CAPTCHA
• Consider implementing a custom input validation layer that whitelist-validates email format before processing

# Example: Restrict access to forgot-password.php via .htaccess
# Add to .htaccess file in the application root directory
<Files "forgot-password.php">
    Order Deny,Allow
    Deny from all
    # Allow only from trusted IP ranges if needed
    # Allow from 192.168.1.0/24
</Files>