CVE-2026-36232: Student Enrollment System SQLi Flaw

CVE-2026-36232 Overview

A SQL injection vulnerability was found in the instructorClasses.php file of itsourcecode Online Student Enrollment System v1.0. The vulnerability exists because the classId parameter from $_GET['classId'] is directly concatenated into the SQL query without any sanitization or validation. This allows unauthenticated remote attackers to execute arbitrary SQL commands against the backend database.

Critical Impact

This vulnerability allows unauthenticated attackers to access, modify, or delete sensitive student enrollment data, potentially compromising the entire database including personal information and academic records.

Affected Products

• itsourcecode Online Student Enrollment System v1.0

Discovery Timeline

• 2026-04-10 - CVE CVE-2026-36232 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2026-36232

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), representing one of the most dangerous web application vulnerabilities. The flaw resides in the instructorClasses.php file where user-supplied input via the classId GET parameter is directly incorporated into SQL queries without proper sanitization, parameterization, or input validation.

The attack requires no authentication and can be exploited remotely over the network. An attacker can manipulate the classId parameter to inject malicious SQL statements, potentially gaining unauthorized access to the entire database. The impact is severe as successful exploitation could lead to complete database compromise, including extraction of sensitive student records, modification of enrollment data, and potential administrative account takeover.

Root Cause

The root cause is improper input validation and the use of string concatenation to build SQL queries. Instead of using parameterized queries or prepared statements, the application directly inserts user-controlled input into SQL statements. This is a fundamental secure coding violation that enables classic SQL injection attacks.

Attack Vector

The vulnerability is exploitable via the network with no authentication required. An attacker crafts a malicious HTTP GET request to instructorClasses.php with a specially crafted classId parameter containing SQL injection payloads. Common attack techniques include:

• Union-based injection: Extracting data from other tables by appending UNION SELECT statements
• Boolean-based blind injection: Inferring database contents through true/false responses
• Time-based blind injection: Using SQL sleep functions to extract data character by character
• Error-based injection: Leveraging database error messages to extract information

The vulnerability can be exploited by appending SQL syntax to the classId parameter, such as adding single quotes, UNION statements, or comment characters to manipulate the underlying query logic. Technical details and proof-of-concept information are available in the GitHub PoC Repository.

Detection Methods for CVE-2026-36232

Indicators of Compromise

• Anomalous HTTP requests to instructorClasses.php containing SQL keywords (UNION, SELECT, INSERT, UPDATE, DELETE, DROP, etc.) in the classId parameter
• Database error messages appearing in web server logs or responses
• Unusual database query patterns or execution times indicating blind SQL injection attempts
• Unexpected database modifications or data exfiltration activities

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in GET parameters
• Monitor web server access logs for requests containing SQL syntax characters such as single quotes, double dashes, semicolons, and SQL keywords
• Deploy database activity monitoring to detect unusual query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) to alert on SQL injection attack signatures

Monitoring Recommendations

• Enable detailed logging on the web server and database server to capture all queries executed against the enrollment system
• Set up real-time alerting for any requests to instructorClasses.php that contain suspicious characters or SQL keywords
• Perform regular database integrity checks to detect unauthorized modifications to student enrollment records
• Monitor for unusual outbound data transfers that could indicate data exfiltration

How to Mitigate CVE-2026-36232

Immediate Actions Required

• Restrict access to the instructorClasses.php endpoint until a patch is available or the code can be remediated
• Implement a Web Application Firewall with SQL injection protection rules in front of the application
• Review database user permissions and apply the principle of least privilege to limit potential damage from successful exploitation
• Backup the database and audit for any signs of unauthorized access or data tampering

Patch Information

No official vendor patch was available at the time of publication. Organizations using itsourcecode Online Student Enrollment System v1.0 should contact the vendor for remediation guidance or implement the workarounds listed below. The vulnerable code in instructorClasses.php should be modified to use parameterized queries (prepared statements) instead of direct string concatenation.

Workarounds

• Implement input validation to ensure the classId parameter only accepts numeric values before processing
• Deploy a reverse proxy or WAF to filter malicious SQL injection payloads before they reach the application
• Modify the vulnerable PHP code to use PDO or MySQLi prepared statements with parameterized queries
• Consider temporarily disabling the affected functionality until proper remediation can be implemented
• Restrict network access to the application to trusted IP ranges if internet exposure is not required

The recommended fix involves replacing direct SQL concatenation with parameterized queries. For PHP applications, this means using PDO prepared statements where the classId parameter is bound as a parameter rather than concatenated into the query string. Additionally, implementing input validation to ensure classId is an integer value provides defense-in-depth protection.