CVE-2025-9662: Simple Grading System SQL Injection Flaw

CVE-2025-9662 Overview

A SQL Injection vulnerability has been identified in code-projects Simple Grading System 1.0. This vulnerability affects the /login.php file within the Admin Panel component. An attacker can exploit this flaw by manipulating input parameters to inject malicious SQL queries, potentially gaining unauthorized access to the database. The vulnerability is remotely exploitable and the exploit has been publicly disclosed.

Critical Impact

Unauthenticated remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data, modify database contents, or potentially gain further access to the underlying system.

Affected Products

• Fabian Simple Grading System 1.0
• code-projects Simple Grading System /login.php component

Discovery Timeline

• August 29, 2025 - CVE-2025-9662 published to NVD
• September 8, 2025 - Last updated in NVD database

Technical Details for CVE-2025-9662

Vulnerability Analysis

This SQL Injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) exists in the authentication mechanism of the Simple Grading System application. The /login.php file in the Admin Panel fails to properly sanitize user-supplied input before incorporating it into SQL queries. This allows an attacker to inject arbitrary SQL commands that are executed by the database server.

The vulnerability is accessible over the network without requiring any authentication or user interaction, making it particularly dangerous for internet-facing deployments. Successful exploitation can lead to unauthorized data access, data manipulation, and in some cases, complete system compromise through database server capabilities.

Root Cause

The root cause of this vulnerability is insufficient input validation and the lack of parameterized queries (prepared statements) in the login functionality. The application directly concatenates user input into SQL query strings without proper sanitization or escaping, allowing attackers to break out of the intended query structure and inject malicious SQL code.

Attack Vector

The attack vector involves sending specially crafted HTTP requests to the /login.php endpoint with malicious SQL payloads in the username or password fields. Since the application runs with database privileges, successful SQL injection can allow attackers to:

• Bypass authentication entirely
• Extract sensitive data from the database including user credentials
• Modify or delete database records
• Potentially execute system commands if database functions allow

The vulnerability is exploitable remotely without any prior authentication, and the exploit methodology has been publicly disclosed. Attackers can leverage common SQL injection techniques such as authentication bypass payloads, UNION-based extraction, or time-based blind injection depending on the application's response behavior.

Detection Methods for CVE-2025-9662

Indicators of Compromise

• Unusual or malformed requests to /login.php containing SQL syntax characters such as single quotes, double dashes, semicolons, or UNION statements
• Database error messages appearing in application logs or responses
• Unexpected database queries or access patterns in database audit logs
• Failed login attempts with payloads containing SQL keywords (SELECT, UNION, OR, AND)
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests targeting /login.php
• Enable detailed logging on the web server and database server to capture suspicious query patterns
• Implement intrusion detection system (IDS) signatures for common SQL injection attack patterns
• Monitor for anomalous database query execution times which may indicate blind SQL injection attempts
• Review application logs for error messages containing SQL syntax errors or database exception details

Monitoring Recommendations

• Enable comprehensive access logging for the Admin Panel endpoints, particularly /login.php
• Set up alerts for multiple failed authentication attempts with unusual payload characteristics
• Monitor database query logs for queries containing suspicious patterns or unexpected UNION operations
• Implement rate limiting on authentication endpoints to slow down automated exploitation attempts
• Configure SentinelOne Singularity to monitor for post-exploitation behaviors on systems hosting the application

How to Mitigate CVE-2025-9662

Immediate Actions Required

• Immediately restrict network access to the Admin Panel (/login.php) to trusted IP addresses only
• Deploy a Web Application Firewall with SQL injection protection rules in front of the application
• If possible, take the vulnerable application offline until a patch is available or remediation is complete
• Review database logs for any signs of prior exploitation and check for unauthorized data access
• Implement additional authentication controls such as IP whitelisting or VPN requirements for admin access

Patch Information

As of the last update on September 8, 2025, no official vendor patch has been released for this vulnerability. Organizations using Simple Grading System 1.0 should monitor the Code Projects website for security updates. Additional technical details and analysis are available through VulDB.

Workarounds

• Implement prepared statements/parameterized queries in the /login.php code if source access is available
• Deploy a reverse proxy with SQL injection filtering capabilities in front of the application
• Restrict database user privileges to minimum required operations (principle of least privilege)
• Add input validation and sanitization at the application layer for all user-supplied fields
• Consider migrating to an alternative grading system with better security practices if patching is not feasible

# Example: Restrict access to admin panel using Apache .htaccess
# Add this to .htaccess in the admin directory

<Files "login.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>

# Example: Enable mod_security SQL injection protection
SecRule ARGS "@detectSQLi" "id:1,phase:2,deny,status:403,log,msg:'SQL Injection Detected'"