CVE-2026-1619

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

EPSS Score 0.0002 6.0th percentile

Risk Priority 17 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-1619 is a high-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Uni-Yaz Flexcity. Its CVSS base score is 8.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 6.0th 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

SI-2 Flaw Remediation good match

prevent

Remediates the authorization bypass flaw by identifying, reporting, and applying the vendor patch to FlexCity/Kiosk version 1.0.36 or later.

AC-3 Access Enforcement good match

prevent

Enforces approved access control policies to prevent low-privilege attackers from bypassing authorization using user-controlled trusted identifiers.

SI-10 Information Input Validation partial match

prevent

Validates user-controlled keys and inputs to mitigate manipulation that exploits trusted identifiers for authorization 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?

Authorization bypass (IDOR-style) via user-controlled keys on a remotely accessible app directly enables remote exploitation for privilege escalation and unauthorized access/modification.

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

NVD Description

Authorization Bypass Through User-Controlled Key vulnerability in Universal Software Inc. FlexCity/Kiosk allows Exploitation of Trusted Identifiers.This issue affects FlexCity/Kiosk: from 1.0 before 1.0.36.

Deeper analysisAI

CVE-2026-1619 is an Authorization Bypass Through User-Controlled Key vulnerability (CWE-639) in Universal Software Inc.'s FlexCity/Kiosk software. It enables exploitation of trusted identifiers through user-controlled keys. The issue affects FlexCity/Kiosk versions from 1.0 up to but not including 1.0.36.

Attackers with low privileges (PR:L) can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation results in high confidentiality (C:H) and integrity (I:H) impacts, with low availability impact (A:L), yielding a CVSS v3.1 base score of 8.3 in an unchanged scope (S:U).

The USOM advisory at https://www.usom.gov.tr/bildirim/tr-26-0065 provides details on the vulnerability, with mitigation achieved by updating to FlexCity/Kiosk version 1.0.36 or later.