Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://flowiseai.com/sunset
- https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.m
- https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-cr
FAQ
What is CVE-2026-70636?
CVE-2026-70636 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 matchi...
How severe is CVE-2026-70636?
CVE-2026-70636 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70636?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.