CVE-2026-5206: Simple Gym Management System SQLi Flaw

CVE-2026-5206 Overview

A SQL Injection vulnerability has been identified in code-projects Simple Gym Management System version 1.0. This vulnerability affects the Payment Handler component, where improper input validation allows attackers to manipulate multiple parameters including Payment_id, Amount, customer_id, payment_type, and customer_name to execute arbitrary SQL commands against the backend database. Remote exploitation is possible, and the exploit has been publicly disclosed.

Critical Impact

Attackers can exploit this SQL Injection vulnerability to extract sensitive customer data, modify payment records, or potentially compromise the entire database through malicious SQL queries injected via the Payment Handler component.

Affected Products

• code-projects Simple Gym Management System 1.0
• Payment Handler Component

Discovery Timeline

• 2026-03-31 - CVE-2026-5206 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-5206

Vulnerability Analysis

This SQL Injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) resides in the Payment Handler component of the Simple Gym Management System. The application fails to properly sanitize user-supplied input before incorporating it into SQL queries, allowing attackers to inject malicious SQL statements.

The vulnerable parameters span multiple fields within the payment processing functionality, including Payment_id, Amount, customer_id, payment_type, and customer_name. This broad attack surface indicates a systemic lack of input validation and parameterized query usage throughout the payment handling logic.

Root Cause

The root cause of this vulnerability is the improper neutralization of special elements in user-controlled input before it is used in SQL query construction. The Payment Handler component directly concatenates user input into SQL queries without proper sanitization, prepared statements, or parameterized queries. This allows attackers to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The vulnerability is exploitable remotely over the network without requiring user interaction. An authenticated attacker with low privileges can manipulate any of the vulnerable payment parameters to inject SQL code. By crafting malicious input containing SQL metacharacters and commands, an attacker can:

• Extract sensitive customer information and payment records from the database
• Modify or delete existing payment data
• Potentially escalate privileges within the database
• In some configurations, achieve code execution on the underlying database server

The attack can be executed through normal HTTP requests to the Payment Handler endpoint, making it accessible to any user with network access to the application. Additional technical details are available in the GitHub CVE Issue #5 and VulDB Vulnerability #354336.

Detection Methods for CVE-2026-5206

Indicators of Compromise

• Unusual SQL syntax or metacharacters (single quotes, double dashes, UNION statements) appearing in payment-related HTTP request parameters
• Database error messages exposed in application responses indicating query failures
• Unexpected database query patterns or execution of administrative SQL commands
• Anomalous access to customer payment records or bulk data extraction attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in Payment_id, Amount, customer_id, payment_type, and customer_name parameters
• Monitor application logs for SQL syntax errors and database exception messages
• Deploy database activity monitoring to detect anomalous query patterns or unauthorized data access
• Configure intrusion detection systems with signatures for common SQL injection attack payloads

Monitoring Recommendations

• Enable detailed logging on the Payment Handler component to capture all incoming request parameters
• Set up alerts for database queries containing SQL keywords in unusual contexts (UNION, SELECT, INSERT, DELETE, DROP)
• Monitor for authentication bypass attempts and privilege escalation activities within the application
• Review database audit logs regularly for unauthorized access patterns to customer and payment tables

How to Mitigate CVE-2026-5206

Immediate Actions Required

• Restrict network access to the Simple Gym Management System to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules as an interim control
• Disable or restrict access to the Payment Handler component until a patch is applied
• Review and audit all database access logs for signs of prior exploitation

Patch Information

No official patch has been released by the vendor at this time. Organizations should monitor the Code Projects website for security updates and patches. Until an official fix is available, implement the recommended workarounds to reduce exposure.

Workarounds

• Deploy input validation and sanitization on all Payment Handler parameters at the application or WAF level
• Implement prepared statements and parameterized queries if modifying the source code is possible
• Apply the principle of least privilege to database accounts used by the application
• Consider network segmentation to isolate the vulnerable system from critical infrastructure

# Example WAF rule configuration for ModSecurity
SecRule ARGS:Payment_id "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in Payment_id'"
SecRule ARGS:Amount "@detectSQLi" "id:1002,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in Amount'"
SecRule ARGS:customer_id "@detectSQLi" "id:1003,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in customer_id'"
SecRule ARGS:payment_type "@detectSQLi" "id:1004,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in payment_type'"
SecRule ARGS:customer_name "@detectSQLi" "id:1005,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in customer_name'"