CVE-2026-71918: DrayTek VigorSwitch Multiple Models OS Command Injection via webBackupAction
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the webBackupAction function. The vulnerability is caused by insufficient filtering of the option, key, pwencode, pathN, and valueN fields before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.
Affected Software
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The attacker needs valid administrative credentials for the device's web management interface. No user interaction is required once those credentials are available.
What is the impact of successful exploitation?
A remote attacker can submit crafted values in the affected fields to execute arbitrary operating-system commands with root privileges. This can fully compromise the confidentiality, integrity, and availability of the device.
Which inputs are implicated in the vulnerable request?
The affected webBackupAction function insufficiently filters the option, key, pw_encode, pathN, and valueN fields before command execution. Administrators should treat access to this function as security-sensitive.