Is CVE-2026-76866 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-76866?

CVE-2026-76866 has a CVSS v3 severity of HIGH (7.2).

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CVE-2026-76866

Description

Netcore NR255-V firmware version 1.5.130703 builds root-run command lines from unquoted user-supplied DDNS input in DDNSset_cgi.c and related ddns_Proc.c components, enabling os command argument injection. Attackers can exploit the unsanitized parameters to inject additional command arguments executed with root privileges.