Executive Summary

CVE-2026-8265 is an OS command injection vulnerability found in the Tenda AC6 V2.0 router firmware version 15.03.06.23. It exists in the get_log_file function of the /bin/httpd component, specifically related to the handling of the "wans.flag" parameter.

The vulnerability occurs because the "wans.flag" parameter is read and directly inserted into a system command without proper input validation. This allows an attacker to inject arbitrary shell commands by escaping the intended command context.

An attacker can exploit this remotely by sending a specially crafted POST request to the /goform/getLogFile endpoint with malicious input in the "wans.flag" parameter, leading to execution of arbitrary commands on the device.

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Impact Analysis

This vulnerability can allow a remote attacker to execute arbitrary operating system commands on the affected Tenda AC6 router. This could lead to unauthorized control over the device.

Potential impacts include disruption of network services, unauthorized access to sensitive information, modification or deletion of data, and using the compromised device as a foothold for further attacks within the network.

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Detection Guidance

This vulnerability can be detected by sending a specially crafted POST request to the /goform/getLogFile endpoint of the Tenda AC6 router and observing if arbitrary commands are executed.

For example, sending a POST request with the payload wans.flag=";id;" can test if the device executes the 'id' command, indicating the presence of the OS command injection vulnerability.

A sample command using curl to test this would be:

• curl -X POST http://<router-ip>/goform/getLogFile -d 'wans.flag=";id;"'

If the response contains output from the 'id' command or other unexpected command execution results, the vulnerability is present.

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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

To mitigate the CVE-2026-8265 vulnerability, immediate steps include restricting remote access to the affected Tenda AC6 router, especially to the /goform/getLogFile endpoint.

Ensure that only trusted users with appropriate privileges can access the device management interface, as the vulnerability requires high privileges (PR:H).

Monitor network traffic for suspicious POST requests targeting the wans.flag parameter to detect potential exploitation attempts.

Check for and apply any available firmware updates or patches from the vendor that address this command injection vulnerability.

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