Threat landscape
high

IBM Langflow Desktop und OSS: Mehrere Schwachstellen

WID-SEC-2026-1340 · first 04.05.2026 · updated 04.05.2026 · CVSS 8,8

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What it is about

IBM LangChain Desktop ist eine lokale Anwendung zur Entwicklung und Ausführung von LangChain-basierten Anwendungen. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Langflow Desktop ausnutzen, um beliebigen Code auszuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder Cross-Site-Scripting-Angriffe durchzuführen.

Under what conditions?

Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.

What can happen in the worst case

An attacker could use the vulnerability to

  • beliebigen Code auszuführen
  • Daten zu manipulieren
  • vertrauliche Informationen offenzulegen oder Cross-Site-Scripting-Angriffe durchzuführen

Am I affected?

Affected according to the BSI:

  • IBM Langflow Desktop OSS <1.9.0
  • IBM Langflow Desktop <1.9.0

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

What helps?

Update to at least:

  • IBM Langflow Desktop OSS 1.9.0
  • IBM Langflow Desktop 1.9.0

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-2026-3340, CVE-2026-3345, CVE-2026-3346, CVE-2026-4502, CVE-2026-4503, CVE-2026-6542, CVE-2026-6543

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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