CVE-2026-2690: Event Management System SQL Injection

CVE-2026-2690 Overview

A SQL injection vulnerability has been discovered in itsourcecode Event Management System 1.0. The vulnerability exists in an unknown functionality of the file /admin/ajax.php?action=login within the Admin Login component. By manipulating the Username argument, an attacker can inject malicious SQL commands. This vulnerability can be exploited remotely, and exploit code has been published publicly.

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 unauthorized administrative access to the Event Management System.

Affected Products

• itsourcecode Event Management System 1.0

Discovery Timeline

• 2026-02-19 - CVE-2026-2690 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-2690

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the admin login functionality of the Event Management System. The vulnerability stems from improper handling of user-supplied input in the Username parameter during the authentication process.

When a user submits login credentials through the /admin/ajax.php?action=login endpoint, the application fails to properly sanitize or parameterize the Username input before incorporating it into SQL queries. This allows an attacker to inject arbitrary SQL statements that are executed by the database server with the privileges of the application's database connection.

The network-accessible nature of this vulnerability means attackers can exploit it without any prior authentication or special privileges, making it particularly dangerous for internet-facing deployments.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and the use of unsanitized user input directly in SQL queries. The application likely constructs SQL queries through string concatenation rather than using prepared statements or parameterized queries. This classic SQL injection pattern allows attackers to break out of the intended query context and execute arbitrary database commands.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP POST requests to the /admin/ajax.php?action=login endpoint with specially crafted payloads in the Username parameter. These payloads can include SQL syntax designed to:

1. Bypass authentication by manipulating the query logic (e.g., using ' OR '1'='1 patterns)
2. Extract database contents through UNION-based or time-based blind SQL injection techniques
3. Modify or delete database records through stacked queries if supported
4. Potentially execute operating system commands if the database has extended procedures enabled

The vulnerability is documented in a GitHub Issue for CVE-39, and additional analysis is available at VulDB #346490 Analysis.

Detection Methods for CVE-2026-2690

Indicators of Compromise

• Unusual login attempts with SQL metacharacters (single quotes, semicolons, comment sequences) in the username field
• Database error messages appearing in HTTP responses from the /admin/ajax.php endpoint
• Unexpected database queries containing UNION, SELECT, or information_schema references in database logs
• Multiple failed authentication attempts followed by successful admin access from the same IP

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in POST parameters to /admin/ajax.php
• Monitor application and database logs for SQL syntax errors or unusual query patterns
• Deploy intrusion detection signatures for common SQL injection payloads targeting PHP authentication endpoints
• Review access logs for suspicious requests containing encoded SQL metacharacters

Monitoring Recommendations

• Enable detailed logging on the web server and database to capture authentication attempts and query execution
• Set up alerts for repeated login failures or anomalous patterns in the admin login endpoint
• Monitor for unauthorized database read operations or schema enumeration activity
• Implement rate limiting on authentication endpoints to slow down automated exploitation attempts

How to Mitigate CVE-2026-2690

Immediate Actions Required

• Restrict network access to the admin panel (/admin/) to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules
• Review and audit all administrative accounts for unauthorized access
• Consider taking the application offline until a patch is applied or code remediation is complete

Patch Information

At the time of publication, no official patch has been released by the vendor. Organizations using itsourcecode Event Management System 1.0 should contact the vendor or monitor the IT Source Code Overview website for security updates. Additional vulnerability details are available at VulDB #346490 Details.

Workarounds

• Implement network-level access controls to restrict admin panel access to internal networks or VPN-connected users only
• Deploy a WAF configured to block SQL injection attempts targeting the login endpoint
• Modify the application source code to use prepared statements with parameterized queries for all database interactions
• Add input validation to reject username values containing SQL metacharacters

# Example: Block access to admin panel except from trusted IPs (Apache .htaccess)
<Directory "/var/www/html/admin">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Directory>