CVE-2026-19021: Computer Repair Shop System SQLi Flaw

CVE-2026-19021 Overview

CVE-2026-19021 is a SQL injection vulnerability in SourceCodester Computer Repair Shop Management System 1.0. The flaw resides in the /classes/Master.php?f=delete_product endpoint, where the ID parameter is passed to a database query without proper sanitization. Attackers can manipulate the ID argument to inject arbitrary SQL statements against the backend database.

The vulnerability is remotely exploitable over the network and requires no authentication or user interaction. Public disclosure of the exploit has occurred, increasing the risk of opportunistic attacks against exposed installations.

Critical Impact
Unauthenticated remote attackers can inject SQL commands through the ID parameter of the delete_product function, potentially exposing or modifying stored data in the application database.

Affected Products

SourceCodester Computer Repair Shop Management System 1.0
Affected file: /classes/Master.php
Affected function: delete_product (via f=delete_product)

Discovery Timeline

2026-08-06 - CVE-2026-19021 published to NVD
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-19021

Vulnerability Analysis

The vulnerability is a SQL injection flaw classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). The application accepts an ID argument through the delete_product action handler in Master.php and concatenates it directly into a SQL statement.

Because the input is not parameterized or sanitized, an attacker can supply crafted SQL syntax as the ID value. The database engine then executes the injected commands with the privileges of the application's database user. Impact extends to data confidentiality, integrity, and availability across affected tables.

Root Cause

The root cause is the direct interpolation of user-controlled request parameters into SQL query strings within Master.php. The codebase does not enforce prepared statements or bind parameters for the delete_product action. Any request that reaches this handler with a modified ID value can alter the intended query logic.

Attack Vector

An unauthenticated remote attacker sends an HTTP request to /classes/Master.php?f=delete_product with a manipulated ID parameter. Typical payloads use classic SQL injection primitives such as boolean-based, UNION-based, or time-based techniques to extract data or modify records. No credentials, elevated privileges, or user interaction are required to trigger the flaw.

No verified exploit code is published in the referenced advisories beyond the technical description on the GitHub CVE Issue Tracking page and the VulDB Vulnerability Details record. Refer to those sources for technical details.

Detection Methods for CVE-2026-19021

Indicators of Compromise

HTTP requests to /classes/Master.php?f=delete_product containing SQL metacharacters such as ', ", --, ;, UNION, SELECT, or SLEEP( in the ID parameter.
Web server access logs showing repeated requests to the delete_product action from a single source with varying ID values.
Unexpected DELETE, UPDATE, or SELECT operations in database audit logs originating from the application service account.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the ID query parameter for SQL injection signatures on the Master.php endpoint.
Enable database query logging and alert on syntactically anomalous queries generated by the application user.
Correlate application logs with database logs to identify requests that produce errors or unusually long execution times.

Monitoring Recommendations

Monitor outbound data volumes from the database host for signs of bulk exfiltration following requests to delete_product.
Track authentication and session activity in the Computer Repair Shop Management System for anomalous administrative actions.
Alert on any 500-series HTTP responses from /classes/Master.php, which often accompany failed injection attempts.

How to Mitigate CVE-2026-19021

Immediate Actions Required

Restrict network access to the Computer Repair Shop Management System to trusted internal networks or VPN users until a fix is available.
Deploy WAF rules that block requests to /classes/Master.php?f=delete_product containing SQL syntax in the ID parameter.
Review database and application logs for prior exploitation attempts against the delete_product handler.

Patch Information

No official vendor patch has been referenced in the advisory sources. Users of SourceCodester Computer Repair Shop Management System 1.0 should monitor the SourceCodester Security Resource and the VulDB CVE Record for updates. In the absence of an upstream fix, apply source-level remediation by refactoring the delete_product handler in classes/Master.php to use parameterized queries (PDO prepared statements or mysqli_stmt_bind_param).

Workarounds

Modify the delete_product function to cast the ID parameter to an integer before use, for example intval($_POST['id']), and enforce a whitelist of expected values.
Replace inline SQL concatenation with prepared statements and bound parameters throughout Master.php.
Apply least-privilege permissions to the database user account so it cannot perform destructive operations outside required tables.

bash

# Configuration example - example WAF rule (ModSecurity) blocking SQLi in the ID parameter
SecRule REQUEST_URI "@contains /classes/Master.php" \
  "chain,phase:2,deny,status:403,id:1026019021,\
   msg:'CVE-2026-19021 SQLi attempt on delete_product'"
  SecRule ARGS:id "@rx (?i)(union(\s|/\*.*?\*/)+select|sleep\s*\(|--|;|')" "t:none,t:urlDecode"