CVE-2026-11717
Gravedad CVSS v4.0:
CRÍTICA
Tipo:
CWE-287
Autenticación incorrecta
Fecha de publicación:
18/06/2026
Última modificación:
22/06/2026
Descripción
*** Pendiente de traducción *** An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox.<br />
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When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp struct where the Active field is declared as a pointer to a boolean (*bool). The code only explicitly rejects a token if the response contains a populated active field set to false (if introspectResp.Active != nil && !*introspectResp.Active). If an introspection endpoint responds with a payload that completely omits the mandatory active key, the internal variable remains nil, causing the conditional check to short-circuit. As a result, Toolbox accepts authorization tokens missing the "active" field, granting access to protected tools and underlying data sources.
Impacto
Puntuación base 4.0
9.30
Gravedad 4.0
CRÍTICA