CVE-2026-4236: Online Enrollment System SQLi Vulnerability

CVE-2026-4236 Overview

A SQL injection vulnerability has been identified in itsourcecode Online Enrollment System version 1.0. The vulnerability exists in an unknown function of the file /enrollment/index.php?view=add, where improper handling of the txtsearch, deptname, and name parameters allows attackers to inject malicious SQL queries. This vulnerability can be exploited remotely without authentication, potentially allowing unauthorized access to sensitive database information.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract, modify, or delete data from the underlying database, potentially compromising student records, enrollment data, and administrative credentials stored in the Online Enrollment System.

Affected Products

• itsourcecode Online Enrollment System 1.0
• Installations exposing /enrollment/index.php to network access
• Systems with inadequate input validation on enrollment form parameters

Discovery Timeline

• 2026-03-16 - CVE-2026-4236 published to NVD
• 2026-03-16 - Last updated in NVD database

Technical Details for CVE-2026-4236

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), specifically manifesting as a SQL injection flaw. The Online Enrollment System fails to properly sanitize user-supplied input before incorporating it into SQL queries executed against the backend database.

The vulnerable endpoint /enrollment/index.php?view=add accepts multiple parameters including txtsearch, deptname, and name that are directly concatenated into SQL statements without proper parameterization or escaping. This allows attackers to manipulate the query logic by injecting SQL syntax through these input fields.

The vulnerability can be exploited remotely over the network without requiring authentication, making it accessible to any attacker who can reach the vulnerable endpoint. The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild.

Root Cause

The root cause of this vulnerability stems from the application's failure to implement proper input validation and parameterized queries when processing user-supplied data. The PHP application directly interpolates request parameters into SQL query strings, allowing attackers to break out of the intended query context and execute arbitrary SQL commands.

This is a common vulnerability pattern in PHP applications that use string concatenation for database queries instead of prepared statements with bound parameters. The lack of input sanitization functions such as mysqli_real_escape_string() or the use of PDO prepared statements leaves the application exposed to injection attacks.

Attack Vector

The attack is network-based, requiring only HTTP access to the vulnerable endpoint. An attacker can craft malicious HTTP requests containing SQL injection payloads in the txtsearch, deptname, or name parameters. These payloads can be used to:

1. Extract sensitive data from the database using UNION-based or error-based injection techniques
2. Bypass authentication mechanisms by manipulating WHERE clause logic
3. Modify or delete database records through stacked queries (if supported)
4. Potentially escalate to operating system command execution if database permissions allow

The vulnerability requires no user interaction and can be exploited by unauthenticated attackers. For technical details and proof-of-concept information, refer to the GitHub Issue #10 Discussion and VulDB #351159 Analysis.

Detection Methods for CVE-2026-4236

Indicators of Compromise

• Unusual SQL error messages appearing in web server logs related to /enrollment/index.php
• HTTP requests to /enrollment/index.php?view=add containing SQL metacharacters such as single quotes, semicolons, or UNION keywords in the txtsearch, deptname, or name parameters
• Database logs showing anomalous queries with unexpected syntax or UNION SELECT statements
• Unexpected data exfiltration patterns or database access outside normal application behavior

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in requests to the enrollment system
• Implement database activity monitoring to identify queries with suspicious patterns such as UNION-based injections or time-based blind injection techniques
• Configure intrusion detection systems (IDS) to alert on HTTP traffic containing common SQL injection payloads targeting the vulnerable parameters
• Enable detailed PHP and database error logging to capture failed injection attempts

Monitoring Recommendations

• Monitor web server access logs for requests to /enrollment/index.php?view=add with encoded or suspicious parameter values
• Set up alerts for database query errors that may indicate SQL injection attempts
• Implement rate limiting on the enrollment endpoint to slow down automated exploitation attempts
• Review authentication logs for successful logins that may have bypassed normal authentication via SQL injection

How to Mitigate CVE-2026-4236

Immediate Actions Required

• Restrict network access to the vulnerable endpoint /enrollment/index.php using firewall rules or .htaccess configurations until a patch is available
• Implement a Web Application Firewall with SQL injection detection rules to filter malicious requests
• If possible, disable the view=add functionality temporarily until proper input validation can be implemented
• Review and audit database user permissions to ensure the application uses least-privilege access

Patch Information

As of the CVE publication date, no official patch has been released by itsourcecode for this vulnerability. Organizations using the Online Enrollment System should monitor the IT Source Code website and the VulDB #351159 Details page for updates on remediation guidance.

In the absence of an official patch, consider implementing manual code fixes by replacing dynamic SQL queries with prepared statements using PDO or mysqli with parameterized queries.

Workarounds

• Implement server-side input validation to reject requests containing SQL metacharacters in the txtsearch, deptname, and name parameters
• Deploy a reverse proxy with ModSecurity and OWASP Core Rule Set to block SQL injection attempts
• Restrict database user privileges to limit the impact of successful exploitation
• Consider migrating to an alternative enrollment system with better security practices if the vendor does not provide timely patches

# Example .htaccess configuration to restrict access to vulnerable endpoint
<Files "index.php">
    # Restrict access to trusted IP ranges only
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>

# Alternative: Block requests with suspicious SQL injection patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (\%27|'|;|union|select|insert|update|delete|drop) [NC]
RewriteRule ^enrollment/index\.php$ - [F,L]