CVE-2026-101059
7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| universal-tool-calling-protocol | python-utcp | 0 < 1.1.4 | affected |
| universal-tool-calling-protocol | python-utcp | 1.1.4 | unaffected |
Weaknesses
- CWE-918: Server-Side Request Forgery (SSRF)
References
- https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34
- https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypass
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