CVE-2026-36233: Student Enrollment System SQLi Vulnerability

CVE-2026-36233 Overview

A SQL injection vulnerability has been identified in the assignInstructorSubjects.php file of itsourcecode Online Student Enrollment System v1.0. This vulnerability allows remote attackers to inject malicious SQL code through the subjcode parameter, which is passed directly to SQL queries without proper sanitization or validation. The lack of input validation enables attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or complete database compromise.

Critical Impact

This SQL injection vulnerability allows unauthenticated remote attackers to execute arbitrary SQL commands against the backend database, potentially exposing sensitive student enrollment data, credentials, and enabling full database takeover.

Affected Products

• itsourcecode Online Student Enrollment System v1.0
• Systems using assignInstructorSubjects.php with the vulnerable subjcode parameter

Discovery Timeline

• 2026-04-10 - CVE-2026-36233 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2026-36233

Vulnerability Analysis

This SQL injection vulnerability exists due to inadequate input handling in the assignInstructorSubjects.php file. When processing requests, the application takes the subjcode parameter from user input and incorporates it directly into SQL query construction without implementing proper sanitization, parameterized queries, or prepared statements. This classic SQL injection pattern allows attackers to break out of the intended query structure and inject arbitrary SQL commands.

The vulnerability is particularly severe because it requires no authentication to exploit, can be triggered remotely over the network, and provides attackers with direct access to database operations. Successful exploitation could result in unauthorized access to sensitive student data, modification or deletion of enrollment records, extraction of user credentials, and potentially pivoting to further system compromise.

Root Cause

The root cause of this vulnerability is the direct concatenation of user-supplied input (the subjcode parameter) into SQL queries without proper sanitization or the use of parameterized queries. The application fails to implement input validation, allowing special SQL characters and commands to pass through unfiltered. This violates secure coding practices that mandate treating all user input as untrusted.

Attack Vector

The attack can be executed remotely over the network without any authentication requirements. An attacker can craft malicious HTTP requests to the assignInstructorSubjects.php endpoint containing specially crafted SQL payloads in the subjcode parameter. The injected code is then executed by the database with the privileges of the application's database user.

For example, an attacker could manipulate the subjcode parameter to include SQL statements that extract data from other tables, bypass authentication checks, modify existing records, or even execute administrative database operations. The network-accessible nature of the vulnerability combined with no authentication requirements makes it trivial to exploit. Technical details regarding the exploitation method are available in the GitHub PoC documentation.

Detection Methods for CVE-2026-36233

Indicators of Compromise

• Unusual SQL error messages in application logs indicating syntax errors or unexpected query behavior
• Web server access logs showing requests to assignInstructorSubjects.php with suspicious subjcode parameter values containing SQL keywords (UNION, SELECT, INSERT, DROP, etc.)
• Database audit logs revealing unauthorized queries or data extraction attempts
• Abnormal database performance or unexpected query patterns

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the subjcode parameter
• Deploy database activity monitoring to identify suspicious queries originating from the application
• Configure application logging to capture all requests to assignInstructorSubjects.php with parameter values
• Use intrusion detection systems (IDS) with SQL injection signature detection capabilities

Monitoring Recommendations

• Enable comprehensive logging for all requests to the affected PHP endpoint
• Monitor database query logs for unusual patterns, especially queries containing UNION, SELECT with multiple columns, or comment sequences
• Set up alerts for failed authentication attempts combined with SQL error messages
• Regularly review web server logs for scanning activity targeting PHP files with known vulnerabilities

How to Mitigate CVE-2026-36233

Immediate Actions Required

• Restrict access to assignInstructorSubjects.php until a patch can be applied, either by removing the file or implementing access controls
• Implement a Web Application Firewall (WAF) rule to filter requests containing SQL injection patterns in the subjcode parameter
• Review database user privileges and apply principle of least privilege to limit potential damage from successful exploitation
• Audit database logs for any signs of prior exploitation and assess potential data exposure

Patch Information

No official vendor patch has been released at the time of this publication. Organizations should monitor the vendor for security updates. In the absence of an official patch, implementing the workarounds and code-level fixes described below is strongly recommended. Refer to the GitHub advisory documentation for additional technical details.

Workarounds

• Modify the vulnerable PHP code to use prepared statements with parameterized queries instead of string concatenation
• Implement strict input validation on the subjcode parameter, allowing only expected characters (alphanumeric) and rejecting special characters
• Deploy network-level access controls to limit who can reach the vulnerable endpoint
• Consider taking the affected functionality offline until proper remediation can be implemented

# Example: Block suspicious requests at the web server level (Apache)
# Add to .htaccess or Apache configuration

# Block requests containing common SQL injection patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (union|select|insert|drop|update|delete|concat|char|0x) [NC]
RewriteRule ^assignInstructorSubjects\.php$ - [F,L]