CVE-2026-1326 Totolink NR1800X POST Request cstecgi.cgi setWanCfg command injection

Medium 5.3 Published 22 Jan 2026 Updated 23 Feb 2026

Remote attackers can execute arbitrary commands on Totolink NR1800X routers via a crafted POST request to the WAN configuration handler.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-1326?

CVE-2026-1326 is a medium-severity command injection vulnerability in Totolink NR1800X, published on 22 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910. This vulnerability affects the function setWanCfg of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. This manipulation of the argument Hostname causes command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-1326?

It affects 1 product.

Products include Totolink Nr1800x Firmware.

How do I fix CVE-2026-1326?

No fix has been published for CVE-2026-1326 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-2026-1326 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1326 exists.

Sources

Also known as GHSA-c7c4-v9c9-65gw.