CVE-2026-2346: Critical Authorization Bypass in Menulux Mobile App

Executive Summary

A critical authorization bypass vulnerability (CVE-2026-2346) has been disclosed in the Menulux Software Inc. Mobile App, a restaurant management and point-of-sale mobile application. The vulnerability carries a CVSS score of 9.8 and allows remote attackers to bypass authorization controls by manipulating a user-controlled key — a class of weakness classified under CWE-639: Authorization Bypass Through User-Controlled Key.

CVSS Score: 9.8 (Critical)

The flaw is categorized as a Software Integrity Attack vector, meaning a successful exploit can undermine the integrity and trustworthiness of data processed or served by the application. No authentication or user interaction is required to exploit this vulnerability over a network connection.

Vulnerability Overview

Affected Versions

Technical Analysis

What Is CWE-639?

CWE-639: Authorization Bypass Through User-Controlled Key describes a vulnerability pattern where an application uses a user-supplied value (such as an ID, token, or key in a request parameter or header) to determine which resources or operations a user is authorized to access — without adequately validating that the requesting user is actually authorized for that specific key.

In the Menulux Mobile App context, this means an attacker can craft requests that reference resources or API operations belonging to other users or administrative functions by supplying a different user-controlled identifier. The application fails to verify that the authenticated identity (if any) matches the identity encoded in the supplied key.

Attack Scenario

1. Attacker identifies Menulux Mobile App backend API endpoint
2. Attacker sends crafted network request with a manipulated user-controlled key
   (e.g., modified user ID, session token, object reference)
3. Backend application accepts the request and performs the operation
   as if the attacker were the target user or an elevated role
4. Attacker reads, modifies, or deletes data belonging to other accounts
5. In a Software Integrity Attack scenario, attacker injects malicious
   data into orders, configurations, or billing records

Potential Impact

Immediate Remediation

Step 1: Apply Available Patches

Check Menulux Software Inc.'s official advisory and apply any available update immediately:

# Update the mobile app through standard app store channels
# Verify the installed version is later than 12.05.2026

For server-side components of the Menulux platform:

• Contact Menulux support for backend patch availability
• Apply any provided server-side hotfix or configuration changes

Step 2: Restrict API Exposure

If the affected mobile API is exposed directly to the internet, consider restricting access:

# Example: Restrict Menulux API to known IP ranges
location /api/ {
    allow 192.168.1.0/24;  # Known office/mobile gateway IPs
    deny all;
}

Step 3: Enable API Monitoring

Deploy monitoring for anomalous access patterns:

# Monitor for requests with unusual or sequential key patterns
# Alert on: high-volume requests to user-scoped endpoints from single IPs
# Alert on: access to accounts not matching authenticated session

Step 4: Audit Access Logs

Review historical access logs for signs of exploitation:

# Look for patterns of enumeration: sequential user IDs or keys
# Look for access to multiple user contexts from single session
# Review any unusual data modification events in backend logs

If Immediate Patching Is Not Possible

1. Take the mobile API offline or restrict to authenticated corporate VPN only
2. Invalidate all active sessions and require re-authentication
3. Enable enhanced logging on all user-scoped API endpoints
4. Notify affected users if exploitation is suspected based on log review

Detection Indicators

Post-Remediation Steps

1. Confirm patched version is deployed across all installations
2. Rotate all API keys and session tokens as a precaution
3. Audit all recent data modifications for signs of unauthorized changes
4. Implement proper server-side authorization checks — validate that the authenticated user owns or has rights to the requested resource before every operation
5. Deploy a WAF rule to detect and block IDOR/authorization bypass patterns
6. Conduct a broader security review of other API endpoints for similar patterns

Background: Prior Menulux Vulnerability

This is not the first authorization bypass affecting the Menulux Mobile App. CVE-2025-13474 — also an Authorization Bypass Through User-Controlled Key (CWE-639) — affected versions before 9.5.8, with exploitation enabling trusted identifier abuse over the network. The recurrence of the same vulnerability class suggests a systemic issue in the application's authorization architecture that was not fully remediated with prior patches.

References

• NIST NVD — CVE-2026-2346
• CWE-639: Authorization Bypass Through User-Controlled Key
• OWASP — Broken Object Level Authorization (BOLA/IDOR)
• Prior: CVE-2025-13474 — Menulux Mobile App Auth Bypass

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