CVE-2026-2174: Contact Management System Auth Bypass Flaw

CVE-2026-2174 Overview

A security flaw has been discovered in code-projects Contact Management System 1.0. This affects an unknown part of the component CRUD Endpoint. The manipulation of the argument ID results in improper authentication. The attack may be launched remotely, allowing unauthorized users to potentially access or manipulate contact records without proper credentials.

Critical Impact

Remote attackers can bypass authentication controls through ID parameter manipulation on CRUD endpoints, potentially gaining unauthorized access to contact data.

Affected Products

• Fabian Contact Management System 1.0

Discovery Timeline

• 2026-02-08 - CVE CVE-2026-2174 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2026-2174

Vulnerability Analysis

This vulnerability is classified under CWE-287 (Improper Authentication), indicating that the application fails to properly verify the identity of users before granting access to protected resources. The vulnerability exists within the CRUD (Create, Read, Update, Delete) endpoint component of the Contact Management System.

The flaw allows attackers to manipulate the ID argument in requests to bypass authentication mechanisms. This type of vulnerability typically occurs when the application relies solely on client-supplied identifiers without proper session validation or authorization checks. The network-accessible nature of this attack vector makes it particularly concerning, as exploitation does not require local access to the target system.

Root Cause

The root cause of this vulnerability is improper authentication implementation in the CRUD endpoint handler. The application appears to accept and process ID parameters without adequately verifying that the requesting user has been properly authenticated and authorized to access the specified resource. This represents a fundamental failure in the authentication workflow where user identity verification is either missing or insufficiently implemented.

Attack Vector

The attack can be launched remotely over the network without requiring any user interaction or prior authentication. An attacker can craft malicious requests targeting the CRUD endpoint with manipulated ID values. By systematically altering the ID parameter, an attacker may be able to enumerate and access contact records belonging to other users or bypass authentication entirely to perform unauthorized CRUD operations.

The exploitation mechanism involves sending HTTP requests to the vulnerable endpoint with crafted ID parameters. Since authentication checks are improperly implemented, the application processes these requests without validating the legitimacy of the requester.

Detection Methods for CVE-2026-2174

Indicators of Compromise

• Unusual patterns of sequential or randomized ID parameter values in CRUD endpoint requests
• Increased volume of requests to contact management endpoints from single IP addresses
• Access log entries showing successful data retrieval without corresponding authentication events
• Requests containing ID values outside the expected range for the authenticated session

Detection Strategies

• Implement web application firewall (WAF) rules to detect parameter tampering on CRUD endpoints
• Monitor HTTP request logs for anomalous patterns in ID parameter usage
• Deploy intrusion detection signatures targeting improper authentication bypass attempts
• Review access logs for requests to contact management endpoints lacking valid session tokens

Monitoring Recommendations

• Enable detailed logging for all CRUD operations including the source IP, timestamp, and ID parameters
• Configure alerts for authentication failures followed by successful resource access
• Establish baseline metrics for normal CRUD operation patterns and alert on deviations
• Implement real-time monitoring of authentication bypass indicators in security information and event management (SIEM) systems

How to Mitigate CVE-2026-2174

Immediate Actions Required

• Restrict network access to the Contact Management System to trusted IP ranges or internal networks only
• Implement additional authentication layers such as multi-factor authentication where possible
• Review and audit all CRUD endpoint access logs for signs of exploitation
• Consider temporarily disabling public access to the application until a patch is available

Patch Information

No vendor patch information is currently available for this vulnerability. Organizations using Fabian Contact Management System 1.0 should monitor the Code Projects website and VulDB entry #344875 for updates regarding security patches or remediation guidance. Given the lack of official vendor response, users may need to consider alternative contact management solutions or implement compensating controls.

Workarounds

• Deploy a reverse proxy or web application firewall to inspect and validate ID parameters before they reach the application
• Implement network segmentation to limit access to the Contact Management System from untrusted networks
• Add custom authentication middleware to validate session state before processing CRUD requests
• Enable IP-based access controls to restrict system access to authorized administrators only

# Example: Apache configuration to restrict access by IP
<Directory /var/www/contact-management>
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Directory>