CVE-2026-37347: Payroll Management System SQLi Flaw

CVE-2026-37347 Overview

CVE-2026-37347 is a SQL Injection vulnerability affecting SourceCodester Payroll Management and Information System v1.0. The vulnerability exists in the file /payroll/view_employee.php, allowing unauthenticated attackers to inject malicious SQL queries through the network. This flaw enables unauthorized access to sensitive employee payroll data and could potentially allow modification of database records.

Critical Impact

This SQL Injection vulnerability allows remote unauthenticated attackers to extract sensitive payroll and employee information, potentially compromising confidentiality and integrity of the entire database.

Affected Products

• SourceCodester Payroll Management and Information System v1.0

Discovery Timeline

• April 16, 2026 - CVE-2026-37347 published to NVD
• April 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-37347

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The vulnerable endpoint /payroll/view_employee.php fails to properly sanitize user-supplied input before incorporating it into SQL queries. This allows attackers to manipulate the SQL query structure, potentially extracting sensitive data or modifying database contents.

The attack can be conducted remotely over the network without requiring authentication or user interaction, making it particularly dangerous for internet-exposed installations of this payroll system.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the view_employee.php file. User-controlled input is directly concatenated into SQL query strings without adequate sanitization or the use of prepared statements. This allows specially crafted input to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The vulnerability is exploitable via network requests to the /payroll/view_employee.php endpoint. An attacker can craft malicious HTTP requests containing SQL injection payloads in vulnerable parameters. Since no authentication is required, any network attacker with access to the application can exploit this vulnerability.

The attack enables extraction of sensitive employee information including personal data, salary details, and potentially authentication credentials. Additionally, depending on database permissions, attackers may be able to modify or delete records, potentially disrupting payroll operations.

For detailed technical information about the exploitation mechanism, refer to the GitHub CVE Report.

Detection Methods for CVE-2026-37347

Indicators of Compromise

• Unusual or malformed HTTP requests targeting /payroll/view_employee.php containing SQL syntax characters such as single quotes, double dashes, or UNION keywords
• Database error messages appearing in application logs or HTTP responses indicating SQL syntax errors
• Unexpected database queries or unusual query patterns in database audit logs
• Evidence of data exfiltration or unauthorized access to employee records

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in requests to the payroll application
• Monitor application and web server logs for requests containing SQL injection signatures targeting the view_employee.php endpoint
• Implement database activity monitoring to detect anomalous query patterns or unauthorized data access
• Use intrusion detection systems with SQL injection detection signatures

Monitoring Recommendations

• Enable detailed logging for the web application and database servers to capture all requests to sensitive endpoints
• Set up alerts for database errors that may indicate injection attempts
• Monitor for unusual data access patterns in the payroll database, especially bulk data retrieval
• Review authentication logs for failed attempts that may precede exploitation attempts

How to Mitigate CVE-2026-37347

Immediate Actions Required

• Restrict network access to the Payroll Management and Information System to trusted IP addresses only
• Place the application behind a Web Application Firewall configured to block SQL injection attacks
• Consider taking the application offline if it contains sensitive data and cannot be adequately protected
• Review database logs for evidence of prior exploitation

Patch Information

As of the last NVD update on April 16, 2026, no official patch information is available from the vendor. Organizations using this software should monitor the GitHub CVE Report and SourceCodester's official channels for security updates.

Workarounds

• Implement network-level access controls to limit who can reach the application
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules enabled
• If source code access is available, implement prepared statements/parameterized queries in the view_employee.php file
• Restrict database user permissions to minimum required privileges to limit potential damage from successful exploitation

# Example: Restrict access using iptables (Linux)
# Allow only trusted network to access the payroll application
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP