CVE-2026-2166: Fabian Online Reviewer System SQLi Flaw

CVE-2026-2166 Overview

A SQL injection vulnerability has been identified in code-projects Online Reviewer System version 1.0. The vulnerability exists in an unknown function within the /login/index.php file of the Login component. Improper handling of user-supplied input in the username and password parameters allows an attacker to inject malicious SQL statements, potentially leading to unauthorized access, data exfiltration, or database manipulation.

Critical Impact

This SQL injection vulnerability can be exploited remotely without authentication, allowing attackers to bypass login mechanisms, extract sensitive data from the database, or potentially modify database contents.

Affected Products

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

Discovery Timeline

• February 8, 2026 - CVE-2026-2166 published to NVD
• February 10, 2026 - Last updated in NVD database

Technical Details for CVE-2026-2166

Vulnerability Analysis

This SQL injection vulnerability arises from insufficient input validation and sanitization in the login functionality of the Online Reviewer System. The affected component (/login/index.php) processes user authentication credentials without properly escaping or parameterizing SQL queries. When a user submits login credentials, the username and password parameters are directly concatenated into SQL queries, creating an injection point that attackers can exploit.

The attack can be executed remotely over the network without requiring any prior authentication or user interaction. Successful exploitation could allow an attacker to authenticate as any user, extract database contents including user credentials, or perform unauthorized database operations depending on the database user's privileges.

Root Cause

The root cause of this vulnerability (CWE-89: SQL Injection, CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) is the direct use of unsanitized user input in SQL query construction. The application fails to implement parameterized queries or prepared statements, and does not adequately validate or escape special characters in the username and password input fields before incorporating them into database queries.

Attack Vector

The attack vector is network-based, requiring no authentication or user privileges. An attacker can craft malicious input containing SQL meta-characters and inject them through the login form parameters. The exploitation technique typically involves:

1. Accessing the login page at /login/index.php
2. Injecting SQL payloads through the username or password fields
3. Manipulating the authentication query logic to bypass verification or extract data

The vulnerability has been publicly disclosed with an exploit potentially available, increasing the risk of exploitation in the wild. For technical details regarding exploitation methods, refer to the GitHub Issue Discussion and VulDB ID #344868.

Detection Methods for CVE-2026-2166

Indicators of Compromise

• Unusual or malformed entries in web server access logs for /login/index.php containing SQL keywords such as UNION, SELECT, OR, AND, single quotes, or comment characters
• Failed login attempts followed by successful authentication from the same source without valid credentials
• Database query logs showing anomalous queries or error messages indicating SQL syntax issues
• Unexpected database modifications or data extraction activities

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP POST parameters
• Configure intrusion detection systems (IDS) to alert on SQL injection signatures targeting login endpoints
• Implement application-level logging to capture and analyze authentication attempts with suspicious input patterns
• Use database activity monitoring to detect unusual query patterns or unauthorized data access

Monitoring Recommendations

• Enable detailed access logging for the /login/index.php endpoint and review logs regularly for injection attempts
• Monitor database query performance and error rates for anomalies that may indicate exploitation attempts
• Set up alerts for multiple failed authentication attempts that may indicate SQL injection probing
• Implement real-time security information and event management (SIEM) correlation rules for SQL injection indicators

How to Mitigate CVE-2026-2166

Immediate Actions Required

• Restrict network access to the Online Reviewer System login page to trusted IP ranges or VPN users only
• Implement a Web Application Firewall with SQL injection protection rules in front of the application
• Review and audit access logs for any signs of prior exploitation
• Consider temporarily disabling the affected login functionality until a patch is available

Patch Information

As of the last update on February 10, 2026, no official vendor patch has been released for this vulnerability. Organizations using the affected software should monitor the Code Projects Resource for security updates and patch releases. Given that this is a code-projects application maintained by community contributors, users may need to implement manual code fixes or mitigations.

Workarounds

• Implement prepared statements or parameterized queries in the /login/index.php file to prevent SQL injection
• Deploy input validation to restrict username and password fields to alphanumeric characters and safe special characters only
• Place the application behind a reverse proxy with SQL injection filtering capabilities
• Implement rate limiting on login attempts to slow down automated exploitation attempts
• Consider using a different authentication mechanism or adding multi-factor authentication as a compensating control

# Example: Apache mod_security rule to block common SQL injection patterns
# Add to Apache configuration or .htaccess
SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Blocked'"

# Alternative: Restrict access to login page by IP (replace with your trusted IPs)
<Location /login/index.php>
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Location>