Is CVE-2026-101059 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-101059?

CVE-2026-101059 has a CVSS v3 severity of HIGH (7.1).

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CVE-2026-101059

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.