Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution (IBM Langflow OSS)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.72 % · percentile 54 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- ibm
- NVD status
- Modified
Description
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).
Weaknesses (CWE)
- CWE-306 — Missing Authentication for Critical Functionality
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | ibm |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · psirt@us.ibm.com (Secondary) |
Advisories
- GHSA-cf6m-vc3m-7cgm — Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
- PYSEC-2026-4233 — Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
European references
- ENISA EUVD · EUVD-2026-45272
- GCVE · GCVE-0-2026-8505
Affected configurations (NVD CPE)
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*≥ 1.0.0 < 1.10.1
Affected products
| Product | Versions |
|---|---|
| IBM · Langflow OSS | affected 1.0.0 ≤ 1.10.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |