CVE-2026-0700: Intern Membership Management System SQLi

CVE-2026-0700 Overview

CVE-2026-0700 is a SQL injection vulnerability discovered in code-projects Intern Membership Management System version 1.0. The vulnerability exists in an unknown function within the /intern/admin/check_admin.php file. By manipulating the Username argument, an attacker can inject malicious SQL commands that are executed by the backend database. The attack can be launched remotely without authentication, and the exploit has been publicly disclosed.

Critical Impact

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

Affected Products

• code-projects Intern Membership Management System 1.0
• Installations with exposed /intern/admin/check_admin.php endpoint
• Systems without input validation on the Username parameter

Discovery Timeline

• 2026-01-08 - CVE-2026-0700 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-0700

Vulnerability Analysis

This SQL injection vulnerability stems from improper input validation in the administrative authentication mechanism of the Intern Membership Management System. The check_admin.php script processes user-supplied input through the Username parameter without adequate sanitization or parameterized queries. This allows attackers to inject arbitrary SQL statements that are executed directly against the underlying database.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection vulnerabilities where user-controlled input is not properly neutralized before being passed to an interpreter.

Since this is an authentication-related endpoint, successful exploitation could allow attackers to bypass login controls entirely, enumerate database contents including user credentials, or manipulate data within the membership management system.

Root Cause

The root cause of this vulnerability is the failure to implement proper input sanitization and parameterized queries in the check_admin.php file. The Username parameter is directly concatenated or interpolated into SQL queries without escaping special characters or using prepared statements. This fundamental coding flaw allows SQL metacharacters to break out of the intended query context and inject attacker-controlled SQL commands.

Attack Vector

The attack vector for CVE-2026-0700 is network-based, requiring no prior authentication or user interaction. An attacker can craft malicious HTTP requests to the /intern/admin/check_admin.php endpoint with a specially crafted Username parameter containing SQL injection payloads. Common attack techniques include:

The attacker sends crafted input containing SQL syntax such as single quotes, comment sequences (-- or #), and boolean-based or UNION-based injection payloads. These payloads manipulate the query logic to return unauthorized data, bypass authentication checks, or execute administrative database operations.

For detailed technical analysis and proof-of-concept information, refer to the GitHub CVE SQL Injection report.

Detection Methods for CVE-2026-0700

Indicators of Compromise

• Anomalous HTTP requests to /intern/admin/check_admin.php containing SQL metacharacters (single quotes, double dashes, UNION keywords) in the Username parameter
• Database error messages in application logs indicating malformed SQL queries
• Unexpected database queries or administrative actions in database audit logs
• Authentication bypass events where users gain access without valid credentials

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in request parameters
• Implement application-level logging to capture all authentication attempts and flag requests with suspicious characters in the Username field
• Configure database monitoring to alert on unusual query patterns, particularly those involving UNION statements or multiple query execution
• Use intrusion detection systems (IDS) with signatures for SQL injection attack patterns

Monitoring Recommendations

• Enable verbose logging on the web server for all requests to administrative endpoints
• Monitor database query logs for queries originating from the check_admin.php script with unexpected syntax
• Set up alerting for failed login attempts that contain non-alphanumeric characters
• Review web server access logs regularly for automated scanning activity targeting the vulnerable endpoint

How to Mitigate CVE-2026-0700

Immediate Actions Required

• Restrict network access to the /intern/admin/check_admin.php endpoint using firewall rules or IP whitelisting
• Implement a Web Application Firewall (WAF) to filter SQL injection attempts before they reach the application
• Consider taking the affected administrative interface offline until a proper fix can be implemented
• Review database logs for evidence of prior exploitation

Patch Information

At the time of publication, no official patch has been released by code-projects for this vulnerability. Organizations using Intern Membership Management System 1.0 should monitor the Code Projects Resource website for security updates. Additional vulnerability details are available through VulDB #339977.

Workarounds

• Implement server-side input validation to reject any Username input containing SQL metacharacters
• Modify the check_admin.php code to use prepared statements with parameterized queries instead of dynamic SQL construction
• Deploy a reverse proxy with request filtering capabilities to sanitize incoming parameters
• Limit database user privileges for the application to minimum required permissions (principle of least privilege)

# Example Apache .htaccess rule to restrict access to admin endpoint
<Files "check_admin.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Files>