CVE-2026-57999 luci-app-tailscale-community - Command Injection via tailscale.do_login RPC
Authenticated attackers can execute arbitrary commands as root via improper quoting in the Tailscale login RPC method.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-57999?
CVE-2026-57999 is a high-severity command injection vulnerability in openwrt luci-app-tailscale-community, published on 29 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-57999?
How do I fix CVE-2026-57999?
No fix has been published for CVE-2026-57999 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-57999 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57999 exists.
Sources
Also known as GHSA-qr7m-7592-rcvx, GHSA-xwc5-mx58-rh35.