Thecus N4800Eco NAS Server Control Panel - Command Injection Severity: MEDIUM Date: January 16, 2026 Affecting: Thecus N4800Eco NAS Server Control Panel N4800Eco CVE ID: CVE-2021-47816 CWE ID: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CVSS Score: AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N 3.7/10 References: - ExploitDB-49926 - Thecus Official Vendor Homepage - Thecus N4800Eco Product Page - Researcher Blog Credit: Metin Yunus Kandemir Description: Thecus N4800Eco NAS Server Control Panel contains a command injection vulnerability that allows authenticated attackers to execute arbitrary system commands through user management endpoints. Attackers can inject commands via username and batch user creation parameters to execute shell commands with administrative privileges.