Description
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the OAuth2 token refresh endpoint POST /api/v1/oauth2-credential/refresh/:credentialId is unauthenticated by design and performs a server-side HTTP request to the credential-controlled accessTokenUrl without SSRF protections. Runtime validation confirmed that the endpoint was reachable without authentication, triggered outbound POST requests to an attacker-controlled server, reflected the full remote response body to the caller through tokenInfo, and sent client_id, client_secret, grant_type=refresh_token, and refresh_token in the request body. This issue is fixed in version 3.1.3.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| FlowiseAI | Flowise | < 3.1.3 |
References
- https://github.com/FlowiseAI/Flowise/commit/da8b251a9a4c59484ceaf6f71df7406aede7bef2Patch
- https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3Patch, Release Notes
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-r745-8hwv-h473Exploit, Vendor Advisory
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-r745-8hwv-h473Exploit, Vendor Advisory
Timeline
- Published
- Aug 4, 2026
- Last modified
- Oct 23, 2026
- NVD status
- Analyzed