---
id: CVE-2026-70636
title: >-
  Flowise through 3.1.4 contains an authentication bypass vulnerability that
  allows unauthenticated attackers to access the OAuth2 credential refresh
  endpoint by exploiting prefix-based whitelist matching in the authentication
  middleware d…
summary: >-
  Flowise through 3.1.4 contains an authentication bypass vulnerability that
  allows unauthenticated attackers to access the OAuth2 credential refresh
  endpoint by exploiting prefix-based whitelist matching in the authentication
  middleware d…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-862
vendor: flowiseai
product: flowise
affected:
  - flowise <= 3.1.4
published: '2026-08-06'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T16:02:22.903'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70636'
references:
  - url: 'https://flowiseai.com/sunset'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00486
epssPercentile: 0.41013
ingestedAt: '2026-08-09T01:31:46.669Z'
---

## Overview

Flowise through 3.1.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to access the OAuth2 credential refresh endpoint by exploiting prefix-based whitelist matching in the authentication middleware defined in packages/server/src/utils/constants.ts. Attackers can send a POST request to the oauth2-credential refresh route with a trailing credential identifier to bypass all authentication and authorization checks, triggering unauthorized OAuth token rotation against credentials belonging to any workspace and potentially disrupting dependent OAuth integrations. This is a bypass of CVE-2026-41273.

## Affected

- `flowise <= 3.1.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.