CVE-2026-59800
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk69th percentile - higher than 69% of all known CVEs
Summary
9Router before version 0.4.44 contains an OS command injection vulnerability in the unauthenticated POST /api/tunnel/tailscale-install endpoint. The sudoPassword field from the request body is passed to the stdin of a 'sudo -S sh' process, allowing a remote unauthenticated attacker to execute arbitrary OS commands.
Risk Assessment
An attacker can remotely take full control of the device without authentication, leading to complete system compromise, data leakage, or use of the device in attacks against other systems.
Recommendation
Immediately upgrade 9Router to version 0.4.44 or later. If upgrading is not possible, block access to the /api/tunnel/tailscale-install endpoint from untrusted networks.
Original NVD description (English source)
9Router before 0.4.44 contains an OS command injection vulnerability in the unauthenticated POST /api/tunnel/tailscale-install endpoint (this route is not covered by the dashboard middleware matcher, so no authorization check is applied). The sudoPassword field from the request body is written to the stdin of a 'sudo -S sh' child process. When sudo does not prompt for a password (the process runs as root, NOPASSWD is configured, or a recent sudo timestamp cache exists), the sudoPassword value is interpreted by sh as a shell command, allowing a remote unauthenticated attacker to execute arbitrary OS commands. Exploitation evidence was first observed by the Shadowserver Foundation on 2026-07-04 (UTC).