CVE-2026-36235: Student Enrollment System SQLi Flaw

CVE-2026-36235 Overview

A SQL injection vulnerability was discovered in the scheduleSubList.php file of itsourcecode Online Student Enrollment System v1.0. This vulnerability occurs because the subjcode parameter is directly embedded into the SQL query via string interpolation without any sanitization or validation, allowing attackers to manipulate database queries through malicious input.

Critical Impact

This SQL injection vulnerability allows unauthenticated remote attackers to extract, modify, or delete sensitive student enrollment data, potentially compromising the entire database and affecting student records, grades, and personal information.

Affected Products

• itsourcecode Online Student Enrollment System v1.0

Discovery Timeline

• 2026-04-10 - CVE-2026-36235 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2026-36235

Vulnerability Analysis

This SQL injection vulnerability exists in the scheduleSubList.php file of the Online Student Enrollment System. The root issue lies in the improper handling of user-supplied input through the subjcode parameter. When a user submits data via this parameter, the application directly concatenates the input into a SQL query without implementing proper input validation, parameterized queries, or prepared statements.

The vulnerability is exploitable over the network without requiring any authentication or user interaction. A successful attack can lead to full compromise of the underlying database, enabling attackers to read sensitive student records, modify enrollment data, delete critical information, or potentially execute administrative operations on the database server.

Root Cause

The vulnerability stems from insecure coding practices where the subjcode parameter value is directly interpolated into SQL query strings using string concatenation. The absence of input sanitization, parameterized queries, or prepared statements allows malicious SQL commands to be injected and executed by the database engine. This is a classic example of CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the subjcode parameter. When the vulnerable scheduleSubList.php endpoint processes these requests, the injected SQL commands are executed against the database with the application's database privileges.

Typical attack scenarios include using UNION-based injection to extract data from other tables, boolean-based blind injection to enumerate database contents, or time-based blind injection when direct output is not visible. For detailed technical information, refer to the GitHub PoC documentation.

Detection Methods for CVE-2026-36235

Indicators of Compromise

• Unusual or malformed HTTP requests to scheduleSubList.php containing SQL syntax characters such as single quotes, double dashes, semicolons, or UNION keywords in the subjcode parameter
• Database error messages in application logs indicating SQL syntax errors or unexpected query behavior
• Anomalous database queries with unusual SELECT, UNION, or data extraction patterns originating from the web application
• Unexpected data access patterns or bulk data retrieval from student enrollment tables

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common SQL injection patterns targeting the subjcode parameter
• Configure database activity monitoring to alert on unusual query patterns, especially those containing UNION statements or multiple stacked queries
• Enable detailed logging on the web server to capture all requests to scheduleSubList.php for forensic analysis
• Deploy intrusion detection systems with signatures for SQL injection attacks targeting PHP applications

Monitoring Recommendations

• Monitor HTTP access logs for requests to scheduleSubList.php with suspicious parameter values
• Set up real-time alerting for database errors that may indicate injection attempts
• Review database audit logs for unauthorized data access or modifications to enrollment records
• Track application response times as significant delays may indicate time-based blind SQL injection attacks

How to Mitigate CVE-2026-36235

Immediate Actions Required

• Take the affected Online Student Enrollment System offline or restrict access to the scheduleSubList.php endpoint until a patch is applied
• Implement a web application firewall (WAF) rule to block requests containing SQL injection patterns in the subjcode parameter
• Review database logs for evidence of exploitation and assess potential data compromise
• Consider implementing network-level access controls to limit exposure of the vulnerable application

Patch Information

No official vendor patch has been released for this vulnerability at this time. Organizations using itsourcecode Online Student Enrollment System v1.0 should contact the vendor for remediation guidance or implement the workarounds described below. The vulnerability was documented in the GitHub security research repository.

Workarounds

• Modify the source code to use parameterized queries or prepared statements instead of string concatenation for the subjcode parameter
• Implement input validation to restrict the subjcode parameter to expected alphanumeric formats
• Deploy a WAF with SQL injection protection rules in front of the application
• Apply the principle of least privilege to the database user account used by the application to limit potential damage from successful exploitation
• Consider isolating the application on a separate network segment with restricted access

# Example Apache mod_security rule to block SQL injection attempts
# Add to your Apache configuration or .htaccess file
SecRule ARGS:subjcode "@detectSQLi" \
    "id:1001,\
    phase:2,\
    block,\
    msg:'SQL Injection Attempt Detected in subjcode parameter',\
    log,\
    severity:CRITICAL"