CVE-2026-120280
Received Received - Intake

OS Command Injection in WAVLINK WN536AX6-A V260507 WireGuard

Publication date: 2026-11-02

Last updated on: 2026-11-02

Assigner: VulDB

Description
A vulnerability has been found in WAVLINK WN536AX6-A V260507. The impacted element is the function wireguard_cli_group handler of the file /protocol.csp of the component WireGuard. The manipulation of the argument group_id/group_name leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.

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Meta Information

Published
2026-11-02
Last Modified
2026-11-02
Generated
2026-11-02
AI Q&A
2026-11-02
EPSS Evaluated
N/A
NVD
CVE-2026-120280

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
WAVLINK WN536AX6-A V260507

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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.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

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Executive Summary

This is a command injection vulnerability in the WAVLINK WN536AX6-A router. It exists in the wireguard_cli_group handler of the /protocol.csp file. Attackers can inject malicious shell commands through the group_id and group_name parameters, leading to remote code execution with root privileges.

Detection Guidance

To detect this vulnerability, check if your WAVLINK WN536AX6-A router has the wireguard_cli_group handler in /protocol.csp. Verify if the device allows unauthenticated access via FirstLogin=1. Test by sending a request to /protocol.csp with fname=system&opt=login&function=set&usrid= to retrieve a session token. Then attempt command injection using group_id=aa" | <command> #.

Commands to test: curl -v 'http://<router-ip>/protocol.csp?fname=system&opt=login&function=set&usrid=' to get a token. Then curl -v --cookie 'session=<token>' 'http://<router-ip>/protocol.csp?fname=wireguard_cli_group&group_id=aa" | id #'

Impact Analysis

An attacker can exploit this to execute arbitrary commands on the device with root privileges. They can take full control of the router, steal data, install malware, or use it as a pivot point to attack other systems on the network.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations using this device may face compliance violations and legal consequences.

Mitigation Strategies

Immediately disable passwordless login by setting FirstLogin=0. Update the router firmware to a patched version if available. Restrict network access to the router's admin interface. Monitor for suspicious activity or unauthorized commands.

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