CVE-2026-5198: Student Membership System SQLi Vulnerability

CVE-2026-5198 Overview

A SQL injection vulnerability has been identified in code-projects Student Membership System version 1.0. The vulnerability exists in the Admin Login component, specifically in the /admin/index.php file. Attackers can exploit this flaw by manipulating the username and password parameters to inject malicious SQL queries, potentially gaining unauthorized access to the application's database and administrative functions.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability without authentication to bypass login controls, extract sensitive database information, modify or delete data, and potentially gain complete control over the Student Membership System.

Affected Products

• code-projects Student Membership System 1.0
• Admin Login Component (/admin/index.php)

Discovery Timeline

• 2026-03-31 - CVE-2026-5198 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-5198

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs due to inadequate input validation and sanitization in the Admin Login functionality. The application fails to properly sanitize user-supplied input in the username and password fields before incorporating them into SQL queries.

When a user submits login credentials through the /admin/index.php endpoint, the application constructs SQL queries using the raw input values. This allows an attacker to craft malicious input containing SQL syntax that alters the query's logic. The vulnerability can be exploited remotely over the network without requiring prior authentication, making it particularly dangerous for internet-exposed installations.

The exploit has been publicly disclosed, increasing the risk of active exploitation. Additional technical details can be found in the GitHub CVE Issue Tracking and VulDB Vulnerability #354296.

Root Cause

The root cause of this vulnerability is the direct concatenation of user-controlled input into SQL query strings without proper parameterization or input sanitization. The login form fields (username and password) are passed directly to the database query, allowing special SQL characters and commands to be interpreted as part of the query structure rather than as literal data values.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can target the /admin/index.php login page and submit specially crafted values in the username or password fields. By injecting SQL syntax such as single quotes, comment sequences, or boolean logic operators, the attacker can manipulate the authentication query to always return true, effectively bypassing the login mechanism.

For example, the attacker could inject payloads that terminate the legitimate query and append conditions that evaluate to true, or use UNION-based attacks to extract data from other database tables. The publicly disclosed nature of this exploit means that attack payloads are readily available to malicious actors.

Detection Methods for CVE-2026-5198

Indicators of Compromise

• Unusual login attempts to /admin/index.php containing SQL syntax characters such as single quotes ('), double dashes (--), or semicolons (;)
• Database error messages in application logs indicating malformed SQL queries
• Unexpected successful admin logins from unrecognized IP addresses or geographic locations
• Evidence of data exfiltration or unauthorized database queries in database audit logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in login form submissions
• Deploy intrusion detection system (IDS) signatures targeting common SQL injection payloads in HTTP POST requests to /admin/index.php
• Enable detailed logging for all authentication attempts and monitor for anomalous patterns
• Configure database query logging to capture and alert on unusual or malformed queries originating from the web application

Monitoring Recommendations

• Set up real-time alerting for failed login attempts containing suspicious characters or unusually long input strings
• Monitor database connection patterns for unexpected queries or data access patterns
• Implement anomaly detection for administrative actions performed after login to detect compromised accounts
• Review web server access logs regularly for reconnaissance activity targeting the admin login page

How to Mitigate CVE-2026-5198

Immediate Actions Required

• Restrict access to the /admin/index.php endpoint by implementing IP-based access controls or placing it behind a VPN
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules to filter malicious requests
• Consider temporarily disabling the admin login portal until a patch is available or code fixes are implemented
• Audit the database for signs of unauthorized access or data manipulation

Patch Information

As of the last update on 2026-04-01, no official patch has been released by the vendor. Organizations using code-projects Student Membership System 1.0 should monitor code-projects.org for security updates. Given the public disclosure of this vulnerability, implementing compensating controls is strongly recommended until an official fix is available.

For detailed vulnerability information, refer to VulDB Submission #780403 and VulDB Vulnerability CTI #354296.

Workarounds

• Implement prepared statements or parameterized queries in the authentication code to prevent SQL injection attacks
• Add server-side input validation to reject inputs containing SQL special characters in the login fields
• Deploy ModSecurity or similar WAF with OWASP Core Rule Set to block SQL injection attempts
• Implement rate limiting on the login endpoint to slow down automated attack attempts
• Use stored procedures with proper parameterization for all database operations involving user input

# Example Apache .htaccess configuration to restrict admin access by IP
<Files "index.php">
    <Directory "/admin">
        Require ip 192.168.1.0/24
        Require ip 10.0.0.0/8
    </Directory>
</Files>

# Alternative: Block common SQL injection patterns with ModSecurity
SecRule ARGS "@rx (\%27)|(\')|(\-\-)|(\%23)|(#)" \
    "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt Detected'"