CVE-2026-1619: FlexCity/Kiosk Auth Bypass Vulnerability

CVE-2026-1619 Overview

CVE-2026-1619 is an Authorization Bypass Through User-Controlled Key vulnerability (CWE-639) affecting Universal Software Inc. FlexCity/Kiosk software. This vulnerability allows attackers to exploit trusted identifiers, enabling unauthorized access to resources that should be protected by access controls. By manipulating user-controlled key values, attackers can bypass authorization mechanisms and potentially access or modify data belonging to other users.

Critical Impact
This authorization bypass vulnerability enables attackers to exploit trusted identifiers, potentially allowing unauthorized access to sensitive kiosk data and functions through manipulation of user-controlled keys.

Affected Products

Universal Software Inc. FlexCity/Kiosk versions 1.0 through 1.0.35
FlexCity/Kiosk version 1.0.36 and later contain the security fix

Discovery Timeline

February 13, 2026 - CVE-2026-1619 published to NVD
February 13, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1619

Vulnerability Analysis

This vulnerability falls under CWE-639: Authorization Bypass Through User-Controlled Key, commonly known as Insecure Direct Object Reference (IDOR). The FlexCity/Kiosk application fails to properly validate that a user has authorization to access a resource before processing requests that use user-supplied identifiers.

When an application uses user-controllable keys (such as record IDs, user IDs, or session tokens) to directly reference internal objects without proper authorization checks, attackers can manipulate these values to access resources belonging to other users or escalate their privileges within the system.

The network-based attack vector combined with low privileges required means that any authenticated user could potentially exploit this vulnerability to access unauthorized resources, leading to confidentiality and integrity impacts on the affected kiosk systems.

Root Cause

The root cause of this vulnerability is insufficient authorization validation when processing requests that contain user-controlled identifiers. The FlexCity/Kiosk application directly uses user-supplied key values to reference internal objects without verifying that the requesting user has legitimate access rights to those resources. This allows authenticated users to enumerate or guess valid identifiers and access resources outside their authorized scope.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity. An attacker with low-level privileges (authenticated user) can manipulate request parameters containing object identifiers to access or modify data belonging to other users or access restricted functionality.

The attack typically involves:

Authenticating to the FlexCity/Kiosk application with valid credentials
Intercepting or observing requests that contain user-controlled identifiers
Modifying these identifier values to reference other users' resources
Submitting the manipulated requests to access unauthorized data

Since no user interaction is required and the vulnerability affects both confidentiality and integrity, successful exploitation could lead to unauthorized disclosure or modification of sensitive kiosk data.

Detection Methods for CVE-2026-1619

Indicators of Compromise

Unusual patterns of sequential or enumerated resource ID access attempts by single users
Access log entries showing users accessing resources outside their normal scope
Failed authorization attempts followed by successful access to different resource IDs
Anomalous parameter manipulation in HTTP request logs

Detection Strategies

Implement logging and monitoring for all resource access attempts with user-controlled identifiers
Deploy Web Application Firewall (WAF) rules to detect parameter tampering and IDOR attack patterns
Enable application-level auditing to track authorization decisions and failures
Monitor for rapid sequential requests with incrementing or enumerated ID values

Monitoring Recommendations

Configure alerts for users accessing resources outside their typical access patterns
Implement rate limiting and anomaly detection for API endpoints using direct object references
Review access logs regularly for signs of unauthorized resource enumeration
Set up real-time monitoring for failed authorization attempts across the kiosk infrastructure

How to Mitigate CVE-2026-1619

Immediate Actions Required

Upgrade FlexCity/Kiosk to version 1.0.36 or later immediately
Review access logs for signs of exploitation or unauthorized access attempts
Implement additional access controls at the network level to limit exposure
Enable enhanced logging to capture detailed authorization decisions

Patch Information

Universal Software Inc. has addressed this vulnerability in FlexCity/Kiosk version 1.0.36. Organizations should upgrade to this version or later to remediate the vulnerability. For additional details, refer to the USOM Security Notification.

Workarounds

Implement network segmentation to limit access to FlexCity/Kiosk systems to trusted networks only
Deploy a Web Application Firewall (WAF) with rules to detect and block IDOR attack patterns
Enable strict session validation and implement secondary authorization checks at the application layer
Restrict user privileges to the minimum required for their role until patching is complete

bash

# Example: Network-level access restriction for FlexCity/Kiosk
# Restrict access to kiosk management interfaces to trusted IPs only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP