CVE-2026-70636: Flowise 3.1.4 Authentication Bypass via OAuth2 Credential Refresh Endpoint
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Flowiseto a version that resolves this vulnerability.Fixed in 3.1.4Patch CVE-2026-41273
Event History
Frequently Asked Questions
What is the severity of CVE-2026-70636?
The severity of CVE-2026-70636 is high with a score of 7.5.
What is CVE-2026-70636 about?
CVE-2026-70636 is an authentication bypass vulnerability in Flowise 3.1.4 that allows attackers to access protected endpoints.
How do I fix CVE-2026-70636?
To fix CVE-2026-70636, update to the patched version of Flowise that addresses the authentication bypass issue.
Who is affected by CVE-2026-70636?
Users of Flowise version 3.1.4 are affected by CVE-2026-70636.
What could attackers do with CVE-2026-70636?
Attackers could exploit CVE-2026-70636 to gain unauthorized access to the OAuth2 credential refresh endpoint.