CVE-2026-5150: Accounting System 1.0 SQL Injection Flaw

CVE-2026-5150 Overview

A SQL injection vulnerability has been identified in code-projects Accounting System 1.0. This security flaw affects the /viewin_costumer.php file within the Parameter Handler component. Attackers can manipulate the cos_id argument to inject malicious SQL queries, potentially compromising the database and sensitive customer information. The vulnerability can be exploited remotely without authentication, and exploit details have been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially gain unauthorized access to the underlying system through the publicly exposed /viewin_costumer.php endpoint.

Affected Products

• code-projects Accounting System 1.0
• Systems using the /viewin_costumer.php Parameter Handler component
• Web applications implementing the vulnerable cos_id parameter handling

Discovery Timeline

• 2026-03-30 - CVE-2026-5150 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-5150

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) exists in the code-projects Accounting System 1.0. The flaw is located in the /viewin_costumer.php file, which handles customer view requests through a Parameter Handler component.

The vulnerable cos_id parameter fails to properly sanitize user input before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL statements that are then executed by the database backend. The network-accessible nature of this vulnerability means it can be exploited remotely without requiring prior authentication or user interaction.

The exploit has been publicly disclosed, increasing the risk of active exploitation against unpatched systems. Organizations using this accounting software should treat this as a priority security concern.

Root Cause

The root cause of CVE-2026-5150 is improper input validation and the lack of parameterized queries in the /viewin_costumer.php file. The cos_id parameter is directly concatenated into SQL queries without proper sanitization, escaping, or the use of prepared statements. This allows special SQL characters and commands to be interpreted as part of the query structure rather than as data values.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests targeting the /viewin_costumer.php endpoint with a specially crafted cos_id parameter value containing SQL injection payloads.

A typical attack scenario involves sending requests with SQL metacharacters (such as single quotes, semicolons, or SQL keywords like UNION, SELECT, OR) within the cos_id parameter. The vulnerable application processes these malicious inputs without sanitization, causing the injected SQL code to execute against the backend database.

For technical details on the exploitation methodology, refer to the GitHub CVE Issue Discussion and VulDB Vulnerability #354183.

Detection Methods for CVE-2026-5150

Indicators of Compromise

• Unusual or malformed HTTP requests targeting /viewin_costumer.php with suspicious cos_id parameter values
• Database logs showing unexpected queries containing SQL keywords like UNION, SELECT, OR 1=1, or comment sequences (--, /*)
• Web server access logs containing URL-encoded SQL injection patterns in the cos_id parameter
• Abnormal database query execution times or error messages indicating SQL syntax issues

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block SQL injection patterns in the cos_id parameter
• Implement intrusion detection system (IDS) signatures for common SQL injection attack strings targeting /viewin_costumer.php
• Configure database query logging and alerting for suspicious query patterns originating from the accounting application
• Use application security monitoring to detect anomalous parameter values in HTTP requests

Monitoring Recommendations

• Enable verbose logging for the /viewin_costumer.php endpoint and monitor for unusual parameter patterns
• Set up alerts for database errors that may indicate attempted SQL injection exploitation
• Monitor network traffic for reconnaissance activity targeting the accounting system endpoints
• Review application logs regularly for failed SQL queries or access attempts with malformed customer IDs

How to Mitigate CVE-2026-5150

Immediate Actions Required

• Restrict network access to the vulnerable /viewin_costumer.php endpoint until a patch is applied
• Implement input validation to allow only numeric values for the cos_id parameter
• Deploy WAF rules to block common SQL injection patterns targeting this endpoint
• Consider temporarily disabling the affected functionality if business operations permit

Patch Information

No official vendor patch has been identified for this vulnerability at the time of publication. Organizations should monitor the Code Projects Homepage for security updates. In the absence of an official patch, implementing the workarounds and protective measures described below is strongly recommended.

Additional technical details and community discussion can be found at the GitHub CVE Issue Discussion and VulDB Submission #780199.

Workarounds

• Implement prepared statements and parameterized queries for all database interactions involving the cos_id parameter
• Add strict input validation to ensure cos_id accepts only expected integer values
• Deploy network-level access controls to limit exposure of the accounting system to trusted networks only
• Consider using a reverse proxy with SQL injection filtering capabilities in front of the application

# Example Apache configuration to restrict access to vulnerable endpoint
<Location "/viewin_costumer.php">
    # Restrict access to trusted IP ranges only
    Require ip 10.0.0.0/8 192.168.0.0/16
    
    # Block common SQL injection patterns (basic protection)
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (union|select|insert|delete|drop|update|--|;) [NC]
    RewriteRule .* - [F,L]
</Location>