CVE-2026-1623 Totolink A7000R cstecgi.cgi setUpgradeFW command injection

Medium 5.3 Published 29 Jan 2026 Updated 23 Feb 2026

Remote attackers can execute arbitrary commands on Totolink A7000R routers via the setUpgradeFW function in cstecgi.cgi.

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-2026-1623?

CVE-2026-1623 is a medium-severity command injection vulnerability in Totolink A7000R, published on 29 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 A7000R 4.1cu.4154. Impacted is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument FileName 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-2026-1623?

It affects 1 product.

Products include Totolink A7000r Firmware.

How do I fix CVE-2026-1623?

No fix has been published for CVE-2026-1623 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-2026-1623 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1623 exists.

Sources

Also known as GHSA-rjqr-3rwj-fv3p.