CVE-2026-57999 | THREATINT

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.

PUBLISHED Reserved 2026-06-26 | Published 2026-06-29 | Updated 2026-07-14 | Assigner VulnCheck

HIGH: 7.7CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Product status

Default status

unaffected

Any version

affected

Credits

lujie (@lujiefsi) reporter

References

github.com/...t/luci/security/advisories/GHSA-xwc5-mx58-rh35 exploit

github.com/...t/luci/security/advisories/GHSA-xwc5-mx58-rh35 (GitHub Security Advisory (GHSA-xwc5-mx58-rh35)) vendor-advisory

www.vulncheck.com/...nd-injection-via-tailscale-do-login-rpc (VulnCheck Advisory: luci-app-tailscale-community - Command Injection via tailscale.do_login RPC) third-party-advisory

cve.org (CVE-2026-57999)

nvd.nist.gov (CVE-2026-57999)

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