CVE-2026-8505

Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution

Critical · published July 17, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
53.4
In the wild
Unconfirmed
What it is

IBM Langflow OSS 1.0.0 through 1.10.0 has 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 (which is the default setting). 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).

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00719 · 53.4th percentile
Published
2026-07-17T19:06Z
EPSS history
Timeline
  • 17 JUL 19:06Z
    Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
    cvelistv5