CVE-2026-70478
CVE-2026-70478 · Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
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Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.
CVSS 9.2 · Critical · EPSS 0.6% · Fix available
- Published
- Updated
Stack: node