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
# 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'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
