CVE-2026-2198: Online Reviewer System SQLi Vulnerability

CVE-2026-2198 Overview

A SQL injection vulnerability has been identified in Fabian Online Reviewer System 1.0. The vulnerability exists in the file /system/system/admins/assessments/pretest/loaddata.php, where improper sanitization of the difficulty_id parameter allows attackers to inject malicious SQL statements. This flaw enables remote attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data from the database, modify or delete records, and potentially gain further access to the underlying system.

Affected Products

• Fabian Online Reviewer System 1.0
• code-projects Online Reviewer System 1.0

Discovery Timeline

• 2026-02-09 - CVE-2026-2198 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-2198

Vulnerability Analysis

This vulnerability stems from insufficient input validation in the loaddata.php file within the Online Reviewer System's administrative assessment module. The application fails to properly sanitize user-supplied input through the difficulty_id parameter before incorporating it into SQL queries. This classic SQL injection flaw allows attackers to alter the intended query logic by injecting specially crafted SQL statements.

The affected endpoint handles pretest data loading functionality within the assessments module. When processing requests, the application directly concatenates the difficulty_id parameter value into database queries without proper escaping or parameterization, creating a direct injection point for attackers.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and parameterized queries in the loaddata.php file. The application directly incorporates user-controlled input from the difficulty_id parameter into SQL statements without sanitization. This violates secure coding practices by trusting user input and failing to implement prepared statements or proper escaping mechanisms. The weakness is classified under CWE-89 (SQL Injection) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Attack Vector

The attack can be executed remotely over the network without requiring authentication. An attacker can send a specially crafted HTTP request to the vulnerable endpoint /system/system/admins/assessments/pretest/loaddata.php with a malicious payload in the difficulty_id parameter. The injected SQL code is then executed by the database server with the privileges of the application's database user.

The vulnerability allows attackers to perform various SQL injection techniques including:

• Union-based injection - Combining results from unauthorized queries with legitimate ones
• Boolean-based blind injection - Inferring data by observing application behavior differences
• Time-based blind injection - Extracting information by measuring response delays
• Error-based injection - Leveraging database error messages to extract data

For technical details and proof-of-concept information, see the GitHub CVE Issue Tracking and VulDB #344901.

Detection Methods for CVE-2026-2198

Indicators of Compromise

• Unusual database queries or errors in application logs containing SQL syntax from the /system/system/admins/assessments/pretest/loaddata.php endpoint
• HTTP requests to loaddata.php with suspicious characters in the difficulty_id parameter (e.g., single quotes, UNION statements, OR 1=1 patterns)
• Unexpected database access patterns or data exfiltration indicators
• Web server logs showing repeated requests to the vulnerable endpoint with varying payloads

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect SQL injection patterns in requests targeting loaddata.php
• Monitor database query logs for anomalous queries originating from the Online Reviewer System application
• Implement intrusion detection signatures to identify common SQL injection attack patterns
• Enable verbose application logging to capture and alert on database errors and suspicious parameter values

Monitoring Recommendations

• Set up real-time alerting for any requests to /system/system/admins/assessments/pretest/loaddata.php containing SQL keywords or special characters
• Monitor database server for unusual query execution times that may indicate time-based blind SQL injection attempts
• Implement log correlation to detect reconnaissance and exploitation patterns across web and database logs
• Review access logs regularly for automated scanning tools targeting the vulnerable endpoint

How to Mitigate CVE-2026-2198

Immediate Actions Required

• Remove or restrict access to the Online Reviewer System until a patch is available
• Implement input validation at the web server level to block requests with suspicious difficulty_id parameter values
• Deploy WAF rules specifically targeting the vulnerable endpoint to filter malicious requests
• Review database logs for signs of past exploitation and assess potential data compromise

Patch Information

No official patch has been released by the vendor at the time of this writing. Organizations should monitor the Code Projects Resource Hub for security updates. Until a patch is available, implement the recommended workarounds below to reduce exposure.

Workarounds

• Restrict network access to the Online Reviewer System to trusted IP addresses only
• Disable the vulnerable loaddata.php file if the pretest assessment functionality is not critical
• Implement prepared statements and parameterized queries if modifying the source code is possible
• Deploy a WAF with SQL injection protection rules enabled for the application

# Example Apache .htaccess configuration to block access to vulnerable endpoint
<Files "loaddata.php">
    Order Deny,Allow
    Deny from all
    # Allow only trusted admin IPs
    Allow from 192.168.1.0/24
</Files>