CVE-2026-6004: Simple IT Discussion Forum SQLi Flaw

CVE-2026-6004 Overview

A SQL Injection vulnerability has been identified in code-projects Simple IT Discussion Forum version 1.0. The vulnerability exists in the /delete-category.php file where the cat_id parameter is not properly sanitized before being used in SQL queries. This allows remote attackers to manipulate database queries by injecting malicious SQL code through the cat_id argument.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to read, modify, or delete database contents, potentially leading to unauthorized data access, data manipulation, and complete database compromise.

Affected Products

• code-projects Simple IT Discussion Forum 1.0
• Web applications using the vulnerable /delete-category.php endpoint

Discovery Timeline

• 2026-04-10 - CVE-2026-6004 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-6004

Vulnerability Analysis

This SQL Injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs in the category deletion functionality of the Simple IT Discussion Forum application. The cat_id parameter passed to /delete-category.php is directly incorporated into SQL queries without proper input validation or parameterized queries.

The vulnerability is remotely exploitable without authentication, meaning any unauthenticated attacker with network access can target the vulnerable endpoint. The public availability of exploit details increases the risk of active exploitation attempts against unpatched installations.

Root Cause

The root cause of this vulnerability is the lack of proper input sanitization and the use of dynamic SQL query construction. The application directly concatenates user-supplied input from the cat_id parameter into SQL statements instead of using prepared statements or parameterized queries. This allows attackers to escape the intended query context and inject arbitrary SQL commands.

Attack Vector

The attack can be initiated remotely over the network by sending a specially crafted HTTP request to the /delete-category.php endpoint. An attacker can manipulate the cat_id parameter to include SQL injection payloads that alter the query logic.

For example, a malicious request targeting the vulnerable parameter would pass crafted input designed to escape string delimiters and inject SQL commands. Common techniques include UNION-based injection to extract data, boolean-based blind injection for data enumeration, or time-based blind injection when direct output is not visible. The exploit has been publicly disclosed, making it accessible to threat actors. Technical details can be found in the GitHub Issue Discussion and VulDB Vulnerability #356560.

Detection Methods for CVE-2026-6004

Indicators of Compromise

• HTTP requests to /delete-category.php containing SQL syntax in the cat_id parameter (e.g., single quotes, UNION, SELECT, OR 1=1)
• Unusual database query patterns or errors in application logs
• Unexpected database modifications or data exfiltration attempts
• Web server logs showing suspicious parameter values with encoded SQL characters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns targeting the cat_id parameter
• Monitor application and database logs for anomalous query patterns or SQL syntax errors
• Deploy intrusion detection systems (IDS) with signatures for common SQL injection attack patterns
• Review access logs for repeated requests to /delete-category.php with varying payloads

Monitoring Recommendations

• Enable detailed logging for the vulnerable endpoint /delete-category.php
• Set up alerts for database query failures or unusual query execution times
• Monitor for unauthorized data access patterns in database audit logs
• Track failed and successful authentication attempts in conjunction with category deletion activity

How to Mitigate CVE-2026-6004

Immediate Actions Required

• Restrict access to /delete-category.php to trusted IP addresses or authenticated administrators only
• Implement input validation to whitelist only numeric values for the cat_id parameter
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules
• Consider taking the vulnerable application offline until a proper fix is implemented

Patch Information

No official vendor patch is currently available for this vulnerability. Organizations using Simple IT Discussion Forum 1.0 should implement the workarounds below and monitor the Code Projects Resource for security updates. For detailed vulnerability tracking information, refer to VulDB Submission #794333.

Workarounds

• Modify the source code to use prepared statements with parameterized queries for all database operations involving cat_id
• Implement strict input validation to ensure cat_id contains only integer values
• Apply the principle of least privilege to database accounts used by the application
• Consider implementing a custom input filter for the vulnerable parameter as a temporary measure

# Example: Apache mod_security rule to block SQL injection attempts
# Add to your Apache configuration or .htaccess file
SecRule ARGS:cat_id "(?i)(union|select|insert|update|delete|drop|--|;|')" \
    "id:1001,deny,status:403,msg:'SQL Injection Attempt Blocked'"