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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-25)

CWE

CWE-862

Published

2026-08-06

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

Affected

• flowiseai:flowise

References

• https://flowiseai.com/sunset
• https://github.com/Caycon/cve-advisories/blob/main/2026/Flowise/CVE-2026-70636.md
• https://www.vulncheck.com/advisories/flowise-authentication-bypass-via-oauth2-credential-refresh-endpoint

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