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A critical OS command injection vulnerability (CVE-2026-36356, CVSS 9.1) exists in the MeiG Smart FORGE_SLT711 4G LTE CPE, allowing unauthenticated remote code execution as root via a crafted JSON payload sent to the `/action/SetRemoteAccessCfg` endpoint. The vulnerability affects firmware version MDM9607.LE.1.0-00110-STD.PROD-1 and likely all firmware versions of this product line. No patch or workaround is detailed in the provided information.