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Citrix Systems UniconOS: Mehrere Schwachstellen

WID-SEC-2026-3928 · first 14.10.2026 · updated 14.10.2026 · CVSS 7,8

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What it is about

Unicon eLux ist ein Linux-basiertes Betriebssystem für Thin Clients, das eine sichere und verwaltete Umgebung für den Zugriff auf virtualisierte Desktops und Anwendungen bietet. Ein Angreifer kann mehrere Schwachstellen in Citrix Systems UniconOS ausnutzen, um seine Privilegien zu erhöhen, um beliebigen Programmcode auszuführen, um Informationen offenzulegen, und um Dateien zu manipulieren.

Under what conditions?

The BSI does not name any particular preconditions.

What can happen in the worst case

An attacker could use the vulnerability to

  • seine Privilegien zu erhöhen
  • beliebigen Programmcode auszuführen
  • Informationen offenzulegen
  • Dateien zu manipulieren

Am I affected?

Affected according to the BSI:

  • Citrix Systems UniconOS <2607.2
  • Citrix Systems UniconOS <2603 LTSR CU2

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Citrix Systems UniconOS 2607.2
  • Citrix Systems UniconOS 2603 LTSR CU2

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.

Information and sources

CVE: CVE-2026-53562, CVE-2026-53563, CVE-2026-53564

Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.

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