Description
utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| universal-tool-calling-protocol | python-utcp | < 1.1.4 | 1.1.4 |
References
- GitHub Security Advisory (GHSA-8cp3-qxj6-px34) vendor-advisory
- VulnCheck Advisory: utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass third-party-advisory