CVE-2026-101059
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductUniversal-tool-calling-protocol Python-utcp
PublishedSep 27, 2026
First seenSep 27, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- universal-tool-calling-protocol python-utcp1.1.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| universal-tool-calling-protocol python-utcp | v < 1.1.4 | 1.1.4 |
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