SQL Injection in SourceCodester Simple Client Management System

A security vulnerability has been identified in SourceCodester Simple Client Management System version 1.0. The vulnerability originates from improper neutralization of special elements used in SQL commands within the /classes/Master.php file. Specifically, the function handling the 'f=save_service' request fails to properly sanitize the 'ID' argument, permitting an attacker to inject arbitrary SQL commands. This flaw can be exploited remotely by an unauthenticated attacker, potentially leading to unauthorized data exposure, modification, or deletion within the underlying database. The vulnerability has been publicly disclosed and is tracked under CVE-2026-19825, with a CVSS 3.1 base score of 7.3. Organizations utilizing this system should assess their exposure to unauthenticated requests targeting this specific endpoint.

Attack Chain

1. The attacker performs reconnaissance to identify the target application and locate the endpoint /classes/Master.php.
2. The attacker crafts a malicious HTTP GET or POST request targeting the 'f=save_service' action.
3. The attacker injects malicious SQL payload strings into the 'ID' parameter.
4. The application receives the input and processes it through the vulnerable Master.php logic without sanitization.
5. The backend database server executes the attacker-controlled SQL commands as part of its legitimate query process.
6. The attacker leverages the injected queries to exfiltrate data, bypass authentication, or modify sensitive application records.
7. The application returns the results of the malicious query or performs the intended destructive action on the database.

Impact

Successful exploitation of this vulnerability allows an unauthenticated remote attacker to gain unauthorized access to the application database. This can lead to the full compromise of client information, sensitive system configurations, and potential modification or deletion of data within the SourceCodester Simple Client Management System.

Recommendation

• Deploy a Web Application Firewall (WAF) rule to block or sanitize HTTP requests containing common SQL injection characters (such as single quotes, semicolons, and comment indicators) specifically targeting the /classes/Master.php endpoint.
• Audit web server access logs for anomalous requests to /classes/Master.php where the 'ID' parameter contains non-numeric or special characters.
• Implement input validation and parameterized queries within the application's source code to neutralize SQL injection vectors.
• Monitor for CVE-2026-19825 in your environment by identifying all instances of SourceCodester Simple Client Management System 1.0.