Citrix UniconOS Security Bulletin CVE-2026-53562, CVE-2026-53563, and CVE-2026-53564

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Article ID: CTX697187

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Updated On:

Description

Citrix UniconOS is affected by the vulnerability described below

CVE-ID

Description 

Pre-conditions CWE CVSSv4


CVE-2026-53562


Local Privilege Escalation


The attacker must have authenticated, low-privileged local access to the target eLux system

 


CWE-59: Improper Link Resolution Before File Access ("Link Following")


CVSS v4.0 Base Score: 8.5

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N


CVE-2026-53563


Persistent Command Execution


The attacker must have authenticated, low-privileged local access to the target eLux system


CWE-732: Incorrect Permission Assignment for Critical Resource


CVSS v4.0 Base Score: 6.8

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N 

 


CVE-2026-53564


Arbitrary file read and write

The target system must be within range of an attacker-controlled wireless access point, and a user must initiate a connection to the captive portal

CWE-668: Exposure of Resource to Wrong Sphere

CVSS v4.0 Base Score: 5.1
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N 

What Customers Should Do

Citrix strongly recommends that customers upgrade their Citrix UniconOS to versions that contain the fixes as soon as possible.  
Citrix UniconOS versions that contain the fixes are: 

Current Release (CR)

  • Citrix UniconOS 2607.2 and later versions 

Long Term Service Release (LTSR)

  • Citrix UniconOS 2603 LTSR CU2 and later versions 

Environment

The information on this page is being provided to you on an "AS IS" and "AS-AVAILABLE" basis. The issues described on this page may or may not impact your system(s). Cloud Software Group Holdings, Inc. and its affiliates, including Citrix Systems, Inc. (collectively, "Cloud SG") make no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. BY ACCESSING THIS PAGE, YOU ACKNOWLEDGE THAT CLOUD SG SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. Cloud SG reserves the right to change or update the information on this page at any time. Cloud SG accordingly recommends that you always view the latest version of this page. The information contained herein is being provided to you under the terms of your applicable customer agreement with Cloud SG, and may be used only for the purposes contemplated by such agreement. If you do not have such an agreement with Cloud SG, this information is provided under the cloud.com Terms of Use, and may be used only for the purposes contemplated by such Terms of Use.

Issue/Introduction

Severity - High

Description of Problem

Vulnerabilities have been discovered in Citrix UniconOS (formerly eLux). Refer to the information below for further details.

Affected Versions:

The vulnerabilities affect the following supported versions of Citrix UniconOS (formerly eLux).

Current Release (CR)

  • Citrix UniconOS versions BEFORE 2607.2

Long Term Service Release (LTSR)

  • Citrix UniconOS versions BEFORE 2603 LTSR CU2

Additional Information

What Citrix is Doing

Citrix is notifying customers and channel partners about this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at https://support.citrix.com/support-home/topic-article-list?trendingCategory=20&trendingTopicName=Security%20Bulletin  

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at https://support.citrix.com/support-home/home 

Subscribe to Receive Alerts

Citrix strongly recommends that all customers subscribe to receive alerts when a Citrix security bulletin is created or modified at https://support.citrix.com/wolken-support/view/aboutsupport/my-support-alerts

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage: https://www.cloud.com/trust-center/support 

Changelog

2026-10-13 Initial Publication