Auth bypass in Flowiseai Flowise
CVE-2026-70636
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.
Vulnerability class: Broken Access Control
EPSS: 0.005 (40.9th percentile) — read the EPSS interpretation.
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:N/I:H/A:N.
Affected products
- Flowiseai Flowise — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, Not Applicable)
- disclosure@vulncheck.com (Exploit, technical-description, Third Party Advisory, exploit)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-70636?
- CVE-2026-70636 is a high-severity vulnerability in Flowiseai Flowise, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-08-06.
- How severe is CVE-2026-70636?
- High severity. CVSS v3 base score is 7.5 out of 10.