GHSA-qgvm-j2hm-6m38 Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service

• npm flowise: < 3.1.3 → fixed in 3.1.3

Summary The OAuth2 token refresh endpoint (`POST /api/v1/oauth2-credential/refresh/:credentialId`) is in `WHITELIST_URLS`, meaning it requires no authentication. It decrypts the stored credential (containing `clientId`, `clientSecret`, `refresh_token`), sends a refresh request to the configured OAuth provider, and returns the new `access_token` directly in the response body. Root Cause ```typescript // packages/server/src/routes/oauth2/index.ts:393-402 res.json({ success: true, message: 'OAuth2 token refreshed successfully', credentialId: credential.id, tokenInfo: { ...tokenData, // ← includes access_token! has_new_refresh_token: !!tokenData.refresh_token, expires_at: updatedCredentialData.expires_at } }) ``` Whitelist entry at `packages/server/src/utils/constants.ts:40`. Attack Chain 1. Attacker obtains a credential ID (via Finding 2 / public chatflow leak, or enumeration) 2. Attacker calls `POST /api/v1/oauth2-credential/refresh/:credentialId` (no auth required) 3. Server decrypts credential, sends refresh request to OAuth provider with user's `client_secret` 4. Server returns the new `access_token` in the response to the attacker 5. Attacker uses the token to access the victim's connected service (Google, Microsoft, etc.) Docker Validation `POST /api/v1/oauth2-credential/refresh/fake-uuid` returns `{"message":"Credential not found"}` (not 401 Unauthorized), proving the endpoint processes the request without authentication. Impact • OAuth2 access token theft for any connected service • Full access to the victim's third-party accounts (Google, Microsoft, GitHub, etc.) • Client secret transmitted to OAuth provider during refresh • Can also be used for DoS by exhausting refresh token quota Suggested Fix Remove the refresh endpoint from `WHITELIST_URLS` and require authentication: ```typescript // Remove from WHITELIST_URLS in constants.ts // Add authentication check in the route handler ``` --- Credits • Shinobi Security - https://github.com/shinobisecurity