Vulnerability in IBM Langflow OSS

[ Description ]Official description

IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4041

  Langflow: Multiple vulnerabilities Translated from German

  CVE-2026-104328CVE-2026-107328CVE-2026-104331+27 more CVEs

[ References ]References

• www.ibm.com/support/pages/node/7293016