CVE-2026-5534: Online Enrollment System SQLi Vulnerability

CVE-2026-5534 Overview

A SQL Injection vulnerability has been identified in itsourcecode Online Enrollment System version 1.0. This vulnerability affects the Parameter Handler component, specifically within the file /sms/user/index.php?view=edit&id=10. Manipulation of the USERID argument allows attackers to perform SQL injection attacks. The vulnerability can be exploited remotely without authentication, and a public exploit is available.

Critical Impact
This SQL injection vulnerability allows remote attackers to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise.

Affected Products

itsourcecode Online Enrollment System 1.0
Parameter Handler component (/sms/user/index.php)
Systems using the vulnerable USERID parameter handling

Discovery Timeline

2026-04-05 - CVE-2026-5534 published to NVD
2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-5534

Vulnerability Analysis

This vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) exists in the itsourcecode Online Enrollment System's user management functionality. The application fails to properly sanitize user-supplied input in the USERID parameter before incorporating it into SQL queries. This injection flaw allows an attacker to send specially crafted requests to the vulnerable endpoint and execute arbitrary SQL commands against the backend database.

The vulnerability is network-accessible, meaning any attacker who can reach the web application can attempt exploitation without requiring authentication credentials. The publicly available exploit increases the risk of widespread exploitation attempts.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and parameterized queries in the PHP code handling the USERID parameter. The application directly concatenates user-supplied input into SQL queries without sanitization or the use of prepared statements, allowing attackers to inject malicious SQL syntax that alters the intended query logic.

Attack Vector

The attack can be executed remotely via the network by sending HTTP requests to the vulnerable endpoint at /sms/user/index.php?view=edit&id=10. An attacker manipulates the USERID parameter value to inject SQL commands. Since no authentication is required, any network-accessible attacker can exploit this vulnerability.

The vulnerability manifests in the parameter handling function where user input flows directly into database queries. Attackers can craft malicious USERID values containing SQL syntax to bypass authentication, extract sensitive data, modify records, or potentially gain further system access. For technical details on the exploitation technique, see the GitHub Issue Discussion and VulDB entry.

Detection Methods for CVE-2026-5534

Indicators of Compromise

Unusual database queries containing SQL syntax in the USERID parameter
Web server logs showing requests to /sms/user/index.php with encoded SQL characters (e.g., %27, %22, UNION, SELECT)
Unexpected database errors or slow query performance
Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in HTTP requests targeting /sms/user/index.php
Monitor web server access logs for suspicious requests containing SQL keywords or special characters in the USERID parameter
Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access
Use intrusion detection systems (IDS) with SQL injection signature detection capabilities

Monitoring Recommendations

Enable detailed logging for all requests to the Online Enrollment System application
Configure alerts for database query errors or syntax exceptions that may indicate injection attempts
Monitor for bulk data retrieval operations that could signify successful exploitation
Track authentication failures and unusual access patterns to user management endpoints

How to Mitigate CVE-2026-5534

Immediate Actions Required

Restrict network access to the Online Enrollment System to trusted IP addresses only
Implement a Web Application Firewall (WAF) with SQL injection protection rules
Disable or restrict access to the vulnerable /sms/user/index.php endpoint until patched
Review database logs for evidence of past exploitation attempts

Patch Information

No official patch information is currently available from the vendor. Organizations should monitor the IT Source Code website for security updates. Additional vulnerability details are available through VulDB Vulnerability #355287 and the GitHub Issue Discussion.

Workarounds

Deploy a Web Application Firewall (WAF) configured to block SQL injection patterns
Implement network segmentation to restrict access to the enrollment system
If source code access is available, modify the vulnerable code to use prepared statements with parameterized queries
Consider temporarily taking the application offline if it handles sensitive data and cannot be adequately protected

bash

# Example WAF rule to block common SQL injection patterns (ModSecurity)
SecRule ARGS:USERID "@rx (?i)(union|select|insert|update|delete|drop|;|'|\")" \
    "id:100001,phase:2,deny,status:403,msg:'SQL Injection Attempt Blocked'"