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wid-sec-w-2026-0900  ·  Published 2026-03-29  ·  View on BSI CERT-Bund ↗

Langflow: Multiple Vulnerabilities

CVSS 8.8 HIGH

Risk Summary

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint does not enforce any authentication or authorization checks, allowing any unauthenticated user to download images belonging to any flow by knowing (or guessing) the flow ID and file name. The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Affected Vendors

Open Source

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