# CVE-2026-53563: Citrix UniconOS persistent command execution

Source: https://junglewise.ai/threats/cve-2026-53563-vulnerability-in-citrix-uniconos-leading-to-persistent-command  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-53563 · Severity: info · Published 2026-10-13

Citrix UniconOS is an operating system used in Citrix appliances and infrastructure. A vulnerability in this system allows an attacker to execute persistent commands, which could lead to long-term compromise of the affected system and unauthorized control over the infrastructure it manages.

Technologies: [Citrix UniconOS](https://junglewise.ai/threats/technologies/uniconos). Vendors: [Citrix](https://junglewise.ai/threats/vendors/citrix).

## Quick answers

**Is CVE-2026-53563 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53563 being exploited in the wild.

**How severe is CVE-2026-53563?** Informational severity, published 13 October 2026.

**Which products and versions are affected?** Citrix UniconOS before 2607.2 CR and before 2603 LTSR CU2.

**Is there a fix for CVE-2026-53563?** Yes: fixed in UniconOS 2607.2 CR, 2603 LTSR CU2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-53563 attacked?** It is in a network appliance.

**Am I affected by CVE-2026-53563?** Check whether you run Citrix UniconOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in UniconOS 2607.2 CR, 2603 LTSR CU2

## Technical details

A persistent command execution vulnerability exists in Citrix UniconOS before version 2607.2 CR and 2603 LTSR CU2. The vulnerability allows an attacker to execute commands that persist on the system. The specific attack vector and preconditions are not detailed in the available advisory information.

## Affected products

- Citrix UniconOS before 2607.2 CR and before 2603 LTSR CU2

## Timeline

- 2026-10-13: disclosed

## References

- [https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697187](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697187)

## Related threats

- [Citrix UniconOS arbitrary file read and write](https://junglewise.ai/threats/cve-2026-53564-vulnerability-in-citrix-uniconos-leading-to-arbitrary-file-read)
- [Citrix UniconOS link following vulnerability](https://junglewise.ai/threats/cve-2026-53562-improper-link-resolution-before-file-access-link-following)