Is CVE-2026-57999 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-57999?

CVE-2026-57999 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-57999

Description

luci-app-tailscale-community contains a command injection vulnerability in the tailscale.do_login RPC method that allows authenticated users to execute arbitrary commands as root. The vulnerability exists because user-controlled loginserver and loginserver_authkey parameters are improperly quoted within a double-quoted shell command, allowing shell substitutions like $() to be evaluated by the outer shell before argument processing.