CVE-2026-57999
Deferred Deferred - Pending Action

Command Injection in luci-app-tailscale-community

Publication date: 2026-06-29

Last updated on: 2026-06-29

Assigner: VulnCheck

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.

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Meta Information

Published
2026-06-29
Last Modified
2026-06-29
Generated
2026-06-30
AI Q&A
2026-06-29
EPSS Evaluated
N/A
NVD
CVE-2026-57999
EUVD
EUVD-2026-40171

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openwrt luci-app-tailscale-community to 0.11.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

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Executive Summary

CVE-2026-57999 is a command injection vulnerability in the luci-app-tailscale-community package, specifically in the tailscale.do_login RPC method.

The flaw occurs because user-controlled parameters (loginserver and loginserver_authkey) are improperly quoted within a double-quoted shell command, allowing shell substitutions like $() to be evaluated by the outer shell before argument processing.

This improper handling enables authenticated users to inject and execute arbitrary commands with root privileges on the affected system.

Impact Analysis

This vulnerability allows an authenticated user with limited privileges to execute arbitrary commands as root on the affected device.

An attacker exploiting this flaw can gain full root access, potentially leading to complete system compromise, unauthorized data access, modification, or destruction, and disruption of services.

Mitigation Strategies

The vulnerability allows authenticated users with read/write access to the luci-app-tailscale-community package to execute arbitrary commands as root via the tailscale.do_login RPC method.

Since no patches are currently available for affected versions, immediate mitigation steps include restricting access to the luci-app-tailscale-community interface to trusted users only.

Additionally, consider disabling or uninstalling the luci-app-tailscale-community package if it is not required, and monitor for any suspicious activity related to the tailscale.do_login RPC method.

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