CVE-2026-2176: Contact Management System SQLi Vulnerability

CVE-2026-2176 Overview

A SQL Injection vulnerability has been identified in the Fabian Contact Management System version 1.0. This issue affects processing within the index.py file, where improper handling of the selecteditem[0] argument enables SQL injection attacks. The vulnerability can be exploited remotely by an authenticated attacker to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion.

Critical Impact

Remote attackers with low privileges can exploit this SQL injection vulnerability to compromise database integrity, extract sensitive contact information, or potentially escalate privileges within the application.

Affected Products

• Fabian Contact Management System 1.0
• code-projects Contact Management System 1.0

Discovery Timeline

• 2026-02-08 - CVE-2026-2176 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2026-2176

Vulnerability Analysis

This SQL injection vulnerability exists due to insufficient input validation and sanitization in the index.py file of the Contact Management System. When user-supplied data is passed through the selecteditem[0] parameter, it is directly incorporated into SQL queries without proper escaping or parameterization. This classic injection pattern allows attackers to insert malicious SQL statements that the database will execute as part of the intended query.

The vulnerability is classified under CWE-89 (SQL Injection) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). These weaknesses indicate that the application fails to properly neutralize special elements that could be interpreted as SQL commands.

Root Cause

The root cause of this vulnerability is the direct concatenation or interpolation of user-controlled input into SQL query strings without proper sanitization. The selecteditem[0] parameter, which appears to be used for selecting contact records, does not undergo adequate validation before being incorporated into database queries. This allows attackers to break out of the intended query structure and inject arbitrary SQL commands.

Attack Vector

The attack can be executed remotely over the network. An attacker with low-level authenticated access to the application can craft malicious input containing SQL metacharacters and commands. By manipulating the selecteditem[0] parameter in requests to index.py, an attacker could:

1. Extract sensitive data from the database by appending UNION SELECT statements
2. Modify or delete existing contact records through injected UPDATE or DELETE commands
3. Potentially escalate privileges if the database user has elevated permissions
4. Enumerate database structure to facilitate further attacks

The vulnerability mechanism involves improper neutralization of user input in the selecteditem[0] parameter within index.py. When a user selects a contact item, the application constructs a SQL query using this parameter value without proper parameterized queries or input escaping. For detailed technical information, refer to the VulDB advisory.

Detection Methods for CVE-2026-2176

Indicators of Compromise

• Unusual database query patterns or errors in application logs related to index.py
• Unexpected SQL syntax errors appearing in server logs
• Evidence of data exfiltration or unauthorized database access attempts
• Anomalous HTTP requests containing SQL keywords targeting the selecteditem parameter

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in requests to index.py
• Monitor application logs for SQL error messages that may indicate injection attempts
• Deploy database activity monitoring to detect anomalous query patterns
• Configure intrusion detection systems with SQL injection attack signatures

Monitoring Recommendations

• Enable detailed logging for all requests to the Contact Management System
• Set up alerts for failed database queries or unusual query execution times
• Monitor for authentication anomalies that could indicate compromised accounts
• Review access logs for suspicious patterns in requests containing selecteditem parameters

How to Mitigate CVE-2026-2176

Immediate Actions Required

• Restrict network access to the Contact Management System to trusted users only
• Implement input validation on all user-supplied parameters, especially selecteditem[0]
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules
• Review and audit all database queries in index.py for proper parameterization

Patch Information

At the time of publication, no official patch has been released by the vendor. Organizations should monitor the Code Projects Resource Hub for security updates. In the absence of an official fix, implementing the workarounds below is strongly recommended to reduce exposure.

Workarounds

• Implement parameterized queries or prepared statements to prevent SQL injection
• Apply input validation to reject SQL metacharacters in the selecteditem parameter
• Use a Web Application Firewall to filter malicious SQL injection payloads
• Limit database user permissions to the minimum required for application functionality
• Consider network segmentation to restrict access to the vulnerable application

The recommended approach is to modify the database query handling in index.py to use parameterized queries. For Python applications, this typically involves using placeholders in the SQL statement and passing user input as separate parameters to the database driver, preventing the interpretation of user data as SQL commands.