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EUVD-2026-348759

fkie_cve-2026-70478

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.

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

Affected: npm: flowise

### 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…

WID-SEC-W-2026-2589 — Flowise: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Flowise ausnutzen, um beliebigen Code auszuführen – sogar mit Root-Rechten –, erweiterte Privilegien zu erlangen, Sicherheitsmaßnahmen zu umgehen, Sitzungen zu kapern sowie Daten offenzulegen oder zu manipulieren.