CVE-2026-1618: FlexCity/Kiosk Auth Bypass Vulnerability

CVE-2026-1618 Overview

CVE-2026-1618 is an Authentication Bypass Using an Alternate Path or Channel vulnerability affecting Universal Software Inc. FlexCity/Kiosk software. This flaw allows attackers to bypass authentication mechanisms through alternate channels, ultimately enabling privilege escalation within the affected system. The vulnerability impacts FlexCity/Kiosk versions from 1.0 before 1.0.36.

Critical Impact

Successful exploitation allows authenticated attackers with low privileges to escalate their access, potentially gaining full control over the affected kiosk systems. This could result in unauthorized access to sensitive data, system configuration changes, and complete compromise of the kiosk infrastructure.

Affected Products

• Universal Software Inc. FlexCity/Kiosk version 1.0 through 1.0.35
• All FlexCity/Kiosk deployments running vulnerable versions before 1.0.36
• Kiosk systems utilizing the affected authentication mechanisms

Discovery Timeline

• February 13, 2026 - CVE-2026-1618 published to NVD
• February 13, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1618

Vulnerability Analysis

This vulnerability falls under CWE-288 (Authentication Bypass Using an Alternate Path or Channel). The flaw exists in how FlexCity/Kiosk handles authentication requests, where alternate pathways or channels can be leveraged to circumvent standard authentication controls. Once bypassed, an attacker with low-level access can escalate privileges to gain unauthorized administrative capabilities.

The attack can be initiated remotely over the network without requiring user interaction. An attacker needs only low-level privileges to begin exploitation, making this vulnerability particularly concerning for organizations with public-facing kiosk deployments or multi-tenant environments.

Root Cause

The root cause of this vulnerability lies in improper implementation of authentication controls within the FlexCity/Kiosk application. The software fails to adequately validate authentication requests across all available channels, allowing attackers to discover and exploit alternate pathways that bypass the primary authentication mechanism. This design flaw enables users with minimal privileges to access functionality and resources that should require elevated permissions.

Attack Vector

The attack leverages the network-accessible interface of the FlexCity/Kiosk system. An attacker with low-level authenticated access identifies alternate channels or API endpoints that do not properly enforce authentication requirements. By routing requests through these unprotected pathways, the attacker bypasses normal authentication controls and gains access to privileged functions.

The exploitation chain typically involves:

1. Establishing low-privilege authenticated session with the target system
2. Identifying alternate authentication channels or endpoints through reconnaissance
3. Submitting crafted requests through the alternate pathway to bypass access controls
4. Executing privileged operations that should be restricted to administrative users

For detailed technical information, see the USOM Security Notification TR-26-0065.

Detection Methods for CVE-2026-1618

Indicators of Compromise

• Unusual authentication patterns showing low-privilege users accessing administrative functions
• Requests to non-standard API endpoints or authentication channels
• Privilege escalation events in system logs where users gain elevated access unexpectedly
• Anomalous network traffic to FlexCity/Kiosk systems from authenticated sessions

Detection Strategies

• Monitor authentication logs for users accessing resources beyond their assigned privilege level
• Implement behavioral analysis to detect deviation from normal user access patterns
• Deploy intrusion detection signatures targeting known authentication bypass techniques
• Audit API endpoint access logs for requests to alternate authentication channels

Monitoring Recommendations

• Enable comprehensive logging on all FlexCity/Kiosk authentication endpoints
• Configure SIEM alerts for privilege escalation events within kiosk systems
• Establish baselines for normal authentication behavior and alert on anomalies
• Review access control configurations regularly to identify potential bypass vectors

How to Mitigate CVE-2026-1618

Immediate Actions Required

• Upgrade Universal Software Inc. FlexCity/Kiosk to version 1.0.36 or later immediately
• Restrict network access to kiosk systems using firewall rules and network segmentation
• Implement additional authentication controls such as multi-factor authentication where possible
• Review and audit user privilege assignments to ensure principle of least privilege

Patch Information

Universal Software Inc. has addressed this vulnerability in FlexCity/Kiosk version 1.0.36. Organizations should apply this update as soon as possible to remediate the authentication bypass vulnerability. For additional details and patch acquisition, consult the USOM Security Notification TR-26-0065.

Workarounds

• Implement network-level access controls to limit exposure of kiosk systems to trusted networks only
• Deploy a web application firewall (WAF) configured to monitor and block suspicious authentication requests
• Enable enhanced logging and monitoring to detect exploitation attempts while awaiting patch deployment
• Consider temporarily disabling remote network access to vulnerable kiosk systems if operationally feasible

# Configuration example - Network access restriction
# Limit access to FlexCity/Kiosk systems to trusted management networks
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Enable enhanced logging for authentication events
# Consult vendor documentation for specific logging configuration