CVE-2026-4253 Tenda AC8 Web UploadCfg route_set_user_policy_rule os command injection

Medium 5.1 Published 16 Mar 2026 Updated 16 Mar 2026

Remote attackers can execute arbitrary OS commands on Tenda AC8 routers via the UploadCfg interface, requiring authentication.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-4253?

CVE-2026-4253 is a medium-severity command injection vulnerability in Tenda Ac8 Firmware, published on 16 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A security flaw has been discovered in Tenda AC8 16.03.50.11. This affects the function route_set_user_policy_rule of the file /cgi-bin/UploadCfg of the component Web Interface. The manipulation of the argument wans.policy.list1 results in os command injection. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-78, CWE-77

Which versions are affected by CVE-2026-4253?

It affects 1 product.

Products include Tenda Ac8 Firmware.

How do I fix CVE-2026-4253?

No fix has been published for CVE-2026-4253 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-4253 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4253 exists.

Public exploit code: 1 proofs of concept on GitHub.

All Tenda Ac8 Firmware vulnerabilities

Sources

Also known as GHSA-6g93-h28j-6gjp.