CVE-2026-5237: Payroll Management System SQLi Vulnerability

CVE-2026-5237 Overview

CVE-2026-5237 is a SQL injection vulnerability in itsourcecode Payroll Management System 1.0. The flaw resides in the /manage_user.php script, where the ID parameter handled by the Parameter Handler component is passed into a database query without proper sanitization. Remote attackers can manipulate the ID argument to inject arbitrary SQL statements. The issue is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). A public exploit has been released, lowering the barrier for opportunistic attacks against exposed deployments.

Critical Impact
Unauthenticated remote attackers can inject SQL through the ID parameter of /manage_user.php, exposing payroll database contents and enabling unauthorized read or modification of stored records.

Affected Products

itsourcecode Payroll Management System 1.0
Vulnerable file: /manage_user.php
Vulnerable component: Parameter Handler (ID argument)

Discovery Timeline

2026-03-31 - CVE-2026-5237 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-5237

Vulnerability Analysis

The vulnerability exists within /manage_user.php in the itsourcecode Payroll Management System 1.0. The ID request parameter is concatenated directly into a SQL query executed by the backend database. Because no parameterized queries or input validation are applied, attackers can break out of the intended query context and append arbitrary SQL clauses. The flaw is reachable over the network without authentication or user interaction, which makes it suitable for automated exploitation through scanners and mass-scan toolkits.

The EPSS probability is 0.043% with a percentile of 13.199, indicating low predicted near-term mass exploitation. However, the public availability of a working proof of concept hosted on GitHub raises the practical risk for any internet-exposed instance.

Root Cause

The root cause is improper neutralization of user-supplied input destined for a SQL interpreter [CWE-74]. The ID parameter is treated as a trusted value and embedded into a query string rather than bound as a typed parameter. Any non-numeric or specially crafted payload submitted in ID is parsed by the database engine as SQL syntax.

Attack Vector

An attacker sends a crafted HTTP request to /manage_user.php with a malicious ID parameter value containing SQL metacharacters such as single quotes, UNION SELECT statements, or boolean-based payloads. The injected SQL is executed in the security context of the application's database account. Depending on database privileges, the attacker can enumerate tables, extract employee records and credentials, modify payroll data, or pivot to deeper compromise. The attack requires no authentication and can be carried out remotely.

No verified exploitation code is reproduced here. Public technical detail and a proof of concept are available in the GitHub SQL Injection Exploit repository and the VulDB Vulnerability #354388 entry.

Detection Methods for CVE-2026-5237

Indicators of Compromise

HTTP requests to /manage_user.php containing SQL metacharacters such as ', ", --, ;, /*, or keywords like UNION, SELECT, SLEEP, BENCHMARK in the ID parameter.
Web server access logs showing unusually long or URL-encoded ID parameter values from a single source IP.
Database error messages or HTTP 500 responses correlated with requests to /manage_user.php.
Outbound database connections or queries returning unusually large result sets following requests to the vulnerable endpoint.

Detection Strategies

Deploy Web Application Firewall (WAF) signatures for SQL injection patterns targeting the ID parameter on /manage_user.php.
Enable database query logging and alert on dynamic queries against the users or payroll tables that originate from the manage_user.php code path.
Hunt in HTTP logs for repeated requests to /manage_user.php?ID= with payloads matching known SQLi fingerprints from the published proof of concept.

Monitoring Recommendations

Forward web server and database logs to a centralized analytics platform for correlation between request payloads and downstream query anomalies.
Baseline normal ID parameter values (numeric, short length) and alert on deviations such as quotes, comments, or boolean expressions.
Monitor authentication and account modification tables for unexpected inserts or updates that could indicate post-exploitation activity.

How to Mitigate CVE-2026-5237

Immediate Actions Required

Restrict network access to the Payroll Management System to trusted internal users via VPN or IP allowlist until a patch is applied.
Deploy WAF rules to block SQL metacharacters in the ID parameter on /manage_user.php.
Audit database logs for the past 30 days to identify suspicious queries originating from the application account.
Rotate credentials and review payroll records for unauthorized modification.

Patch Information

No official vendor patch has been published in the referenced advisories. Users of itsourcecode Payroll Management System 1.0 should monitor the IT Source Code website for updated releases and apply source-level fixes that replace dynamic SQL with parameterized queries using PDO or mysqli prepared statements.

Workarounds

Modify /manage_user.php to cast the ID parameter to an integer using intval() before using it in any SQL query.
Replace string concatenation in SQL queries with prepared statements and bound parameters.
Apply the principle of least privilege to the database account used by the application, removing DROP, ALTER, and write privileges where not required.
Disable verbose database error messages in the PHP configuration to reduce information leakage to attackers.

bash

# Configuration example: harden PHP error reporting and enforce least privilege
# php.ini hardening to reduce information leakage from SQLi probing
display_errors = Off
log_errors = On
error_log = /var/log/php_errors.log

# MySQL least-privilege grant for the application account
# Replace 'payroll_app'@'app_host' and database name as appropriate
REVOKE ALL PRIVILEGES ON payroll_db.* FROM 'payroll_app'@'app_host';
GRANT SELECT, INSERT, UPDATE ON payroll_db.* TO 'payroll_app'@'app_host';
FLUSH PRIVILEGES;