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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| IBM | Langflow OSS | 1.0.0 – ≤ 1.12.4 | — |
Advisories 1
- WID-SEC-2026-4041 Langflow: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 29, 2026
References
- https://www.ibm.com/support/pages/node/7293016 vendor-advisory patch