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critical vulnerability

Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass

Fix availableCritical · CVSS 9.8EPSS 0.72%

Published Oct 5, 2026 · updated Oct 5, 2026

What to do

  1. Upgrade to a fixed version: langflow 1.9.1.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIlangflow9,395 downloads/week

Vulnerable versions
>= 1.7.0, <= 1.9.0
Fixed in
1.9.1

Check your project: pip show langflow

Sources

CWE-306 Missing Authentication for Critical Function

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