CVE-2026-1618

High

Published: 13 February 2026

Published

13 February 2026

Modified

02 March 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0004 11.4th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-1618 is a high-severity Authentication Bypass Using an Alternate Path or Channel (CWE-288) vulnerability in Uni-Yaz Flexcity. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 11.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation for Privilege Escalation (T1068) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations for all logical access paths and channels, directly preventing authentication bypass and subsequent privilege escalation in FlexCity/Kiosk.

SI-2 Flaw Remediation good match

prevent

Provides for timely flaw remediation by patching the specific authentication bypass vulnerability fixed in FlexCity/Kiosk version 1.0.36.

AC-6 Least Privilege partial match

prevent

Enforces least privilege for low-privileged users (PR:L), limiting the impact of privilege escalation following authentication bypass.

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Auth bypass via alternate path directly enables remote exploitation of public-facing software (T1190) leading to privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Authentication Bypass Using an Alternate Path or Channel vulnerability in Universal Software Inc. FlexCity/Kiosk allows Privilege Escalation.This issue affects FlexCity/Kiosk: from 1.0 before 1.0.36.

Deeper analysisAI

CVE-2026-1618 is an Authentication Bypass Using an Alternate Path or Channel vulnerability (CWE-288) in Universal Software Inc.'s FlexCity/Kiosk software. It affects versions from 1.0 prior to 1.0.36 and enables privilege escalation. The vulnerability has a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its network accessibility, low complexity, and significant impacts.

An attacker requires low privileges (PR:L) to exploit this issue remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation allows bypassing authentication via an alternate path or channel, leading to privilege escalation with high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H).

The USOM advisory at https://www.usom.gov.tr/bildirim/tr-26-0065 provides further details on the vulnerability. The issue is addressed in FlexCity/Kiosk version 1.0.36 and later.