CVE-2026-4842: Online Enrollment System SQLi Vulnerability

CVE-2026-4842 Overview

A SQL injection vulnerability has been identified in itsourcecode Online Enrollment System 1.0. This vulnerability affects the Parameter Handler component in the file /sms/grades/index.php?view=edit&id=1, where manipulation of the deptid argument enables SQL injection attacks. The vulnerability can be exploited remotely without authentication, allowing attackers to potentially extract, modify, or delete sensitive data from the backend database.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to compromise the integrity and confidentiality of the enrollment system database, potentially accessing student records, grades, and administrative credentials.

Affected Products

• itsourcecode Online Enrollment System 1.0
• /sms/grades/index.php Parameter Handler component
• Systems running unpatched versions of the Online Enrollment System

Discovery Timeline

• March 26, 2026 - CVE-2026-4842 published to NVD
• March 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-4842

Vulnerability Analysis

This SQL injection vulnerability exists in the grades management component of the itsourcecode Online Enrollment System. The vulnerable endpoint /sms/grades/index.php accepts a deptid parameter that is not properly sanitized before being incorporated into database queries. When an attacker supplies maliciously crafted input to this parameter, the application constructs SQL queries that include the attacker-controlled data, enabling arbitrary SQL command execution against the underlying database.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws where user input is not adequately neutralized before being processed by an interpreter. In this case, the SQL interpreter processes attacker-controlled data as executable commands rather than data values.

Root Cause

The root cause of this vulnerability is insufficient input validation and the absence of parameterized queries in the grades management functionality. The deptid parameter value is directly concatenated into SQL query strings without proper sanitization or the use of prepared statements. This coding practice allows special SQL characters and keywords supplied by attackers to alter the intended query logic.

Attack Vector

The attack can be performed remotely over the network without requiring any authentication. An attacker can craft malicious HTTP requests targeting the vulnerable endpoint with SQL injection payloads in the deptid parameter. Successful exploitation enables attackers to:

• Extract sensitive information from the database including student records, grades, and user credentials
• Modify or delete existing database entries
• Potentially escalate to remote code execution depending on database configuration
• Bypass authentication mechanisms by manipulating query logic

The vulnerability has been publicly disclosed and exploit information is available, as documented in the GitHub Issue Discussion. Attackers can leverage standard SQL injection techniques such as UNION-based injection, blind SQL injection, or time-based injection depending on the application's response behavior.

Detection Methods for CVE-2026-4842

Indicators of Compromise

• Unusual HTTP requests to /sms/grades/index.php containing SQL syntax in the deptid parameter
• Database query logs showing unexpected UNION SELECT, OR 1=1, or other SQL injection patterns
• Error messages in application logs revealing database structure or query syntax errors
• Abnormal database read operations or bulk data extraction activities

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in request parameters
• Implement application-level logging to capture all requests to the vulnerable endpoint
• Configure database auditing to monitor for unusual query patterns or unauthorized data access attempts
• Use intrusion detection systems (IDS) with SQL injection signature detection capabilities

Monitoring Recommendations

• Monitor access logs for repeated requests to /sms/grades/index.php with varying deptid values containing special characters
• Set up alerts for database errors that may indicate injection attempts (syntax errors, type conversion errors)
• Track database user activity for unauthorized SELECT, UPDATE, or DELETE operations on enrollment data
• Review authentication logs for successful logins following unusual database activity patterns

How to Mitigate CVE-2026-4842

Immediate Actions Required

• Restrict network access to the Online Enrollment System to trusted IP ranges only
• Implement a Web Application Firewall with SQL injection protection rules
• Review and sanitize all user inputs to the /sms/grades/index.php endpoint
• Audit database permissions to follow the principle of least privilege

Patch Information

No official vendor patch has been confirmed at the time of publication. Organizations using itsourcecode Online Enrollment System 1.0 should contact the vendor through IT Source Code for security updates. Additional vulnerability information is available via VulDB #353148.

Workarounds

• Implement input validation to reject special characters and SQL keywords in the deptid parameter
• Deploy prepared statements and parameterized queries as a code-level fix
• Use a WAF to filter malicious requests before they reach the application
• Consider taking the affected grades management functionality offline until a proper fix is implemented
• Implement database connection restrictions to limit query capabilities

# Example WAF rule for ModSecurity to block SQL injection attempts
SecRule ARGS:deptid "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection attempt detected in deptid parameter',\
    log,\
    auditlog"