Auth bypass in Flowise
CVE-2026-56270
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.020 (80.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Flowise — versions 0, 3.1.0
- Flowiseai Flowise
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-6pcv-j4jx-m4vx (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/flowise-unauthenticated-oauth-secrets-disclosure-v… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56270?
- CVE-2026-56270 is a high-severity vulnerability in Flowise, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-06-24.
- How severe is CVE-2026-56270?
- High severity. CVSS v3 base score is 7.5 out of 10.