---
title: "CVE-2026-8505: Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass"
url: https://erroneo.us/security/cve/CVE-2026-8505/
description: "CVE-2026-8505 (langflow (PyPI)): IBM Langflow OSS 1.0.0 through 1.10.0 has a vulnerability in Langflow's webhook authentication logic allows unauthenticated…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-17
date_modified: 2026-10-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-8505"
kev: false
cvss: 9.8
epss: 0.00719
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-8505: Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 53: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 53% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes langflow (PyPI) >= 1.7.0, <= 1.9.0, fixed in 1.9.1 . Check your lockfile, including transitive dependencies.

## 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 WEBHOOKAUTHENABLE 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).

## Affected packages

- PyPI `langflow` >= 1.7.0, <= 1.9.0 → fixed: 1.9.1

## Affected products (CVE record)

- IBM Langflow OSS: 1.0.0 <= 1.10.0

## Severity

- ibm CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.72% probability of exploitation activity in the next 30 days; percentile 53.

## Sources

- [ibm.com](https://www.ibm.com/support/pages/node/7278921)
- [GitHub Advisory GHSA-cf6m-vc3m-7cgm](https://github.com/advisories/GHSA-cf6m-vc3m-7cgm)
- [CVE.org record CVE-2026-8505](https://www.cve.org/CVERecord?id=CVE-2026-8505)
- [NVD entry CVE-2026-8505](https://nvd.nist.gov/vuln/detail/CVE-2026-8505)
- [github.com](https://github.com/langflow-ai/langflow/security/advisories/GHSA-cf6m-vc3m-7cgm)
- [github.com](https://github.com/langflow-ai/langflow/pull/12845)
- [github.com](https://github.com/langflow-ai/langflow/commit/cb6f7508dda83ead9c3e4417e96e4b5bd9a260c3)
- [github.com](https://github.com/langflow-ai/langflow/releases/tag/v1.9.1)

---
Source page: https://erroneo.us/security/cve/CVE-2026-8505/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt