Aqara hardcoded OAuth client credentials

The Aqara IAM/SSO Gateway (gw-builder.aqara.com) used a hardcoded OAuth client credential, which is an instance of "CWE-798: Use of Hard-coded Credentials." This issue has an estimated CVSS of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N (9.1 Critical). When combined with CVE-2026-50082, CVE-50084, and CVE-50085, this can lead to a fully unauthenticated, remote takeover of affected devices.