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CVE-2026-70636 is an authentication and authorization bypass vulnerability in Flowise through version 3.1.4 affecting the OAuth2 credential refresh functionality. The flaw stems from prefix-based whitelist matching in the authentication middleware, where the OAuth2 credential refresh route is treated as globally whitelisted and excluded from normal API key and JWT enforcement. By sending a crafted POST request to the OAuth2 credential refresh route with a trailing credential identifier, an unauthenticated attacker can reach the refresh handler without passing authentication checks. The handler then loads credentials by identifier, decrypts the stored OAuth material, performs a token refresh operation, and updates the stored credential record without verifying caller identity, workspace ownership, or role-based authorization. This results in unauthorized cross-workspace manipulation of OAuth credential state and is described as a bypass of the earlier CVE-2026-41273 remediation.
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