vulnerability · Mon 05 Oct 2026 · 22:31 UTC
GHSA-cf6m-vc3m-7cgm: Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
Filed UTCSource GTH ↗
A vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOK_AUTH_ENABLE configuration is set to False. This allows a remote attacker who knows a flow's UUID to execute it as if they were the owner, potentially leading to Remote Code Execution (RCE) or Denial of Service (DoS). ### Details The WEBHOOK_AUTH_ENABLE setting was introduced in v1.7.0 (#9139) with a default of False. The root cause is in the webhook authentication path, `AuthService.
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9.8
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-8505 | — | 0.72% | NVD ↗ |
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