CVE-2026-56270 Flowise - Unauthenticated OAuth Secrets Disclosure via /api/v1/loginmethod Endpoint
Unauthenticated attackers can retrieve cleartext OAuth secrets from the loginmethod endpoint, exposing sensitive SSO credentials for major providers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56270?
CVE-2026-56270 is a high-severity vulnerability in Flowiseai Flowise, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Flowise before 3.1.0 (versions 3.0.13 and earlier) contains a missing authentication vulnerability in the /api/v1/loginmethod endpoint that allows unauthenticated users to retrieve an organization's complete SSO configuration, including OAuth client secrets in cleartext, by providing an organizationId parameter. Remote attackers can send a GET request to harvest sensitive API credentials for Google, Microsoft/Azure, GitHub, and Auth0 integrations. This affects FlowiseAI Cloud and self-hosted instances where the endpoint is exposed.
Weakness: CWE-306
Which versions are affected by CVE-2026-56270?
2 open source packages ship an affected version, including flowise. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
flowise npm | All versions | 3.1.0 |
flowise npm | All versions | 3.1.0 |
Products include Flowiseai Flowise.
How do I fix CVE-2026-56270?
Upgrade flowise to 3.1.0 or later.
Is CVE-2026-56270 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56270 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Flowiseai Flowise
- CVE-2025-71338 Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store API
- CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
- CVE-2025-61913 Flowise is vulnerable to arbitrary file read, arbitrary file write
- CVE-2025-59528 Flowise has Remote Code Execution vulnerability
- CVE-2026-52098 Code injection in n/a
Sources
Also known as GHSA-6pcv-j4jx-m4vx.