CVE-2026-33326 @keystone-6/core: `isFilterable` bypass via `cursor` parameter in findMany

Keystone is a content management system for Node.js. Prior to version 6.5.2, field.isFilterable access control can be bypassed in findMany queries by passing a cursor. This can be used to confirm the existence of records by protected field values. The fix for CVE-2025-46720 field-level isFilterab...