CVE-2026-2155 D-Link DIR-823X Configuration set_dmz sub_4208A0 os command injection

High 8.6 Published 8 Feb 2026 Updated 23 Feb 2026

Remote attackers can execute arbitrary OS commands on D-Link DIR-823X routers via the set_dmz configuration handler.

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-2026-2155?

CVE-2026-2155 is a high-severity command injection vulnerability in D-Link DIR-823X, published on 8 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A security flaw has been discovered in D-Link DIR-823X 250416. The affected element is the function sub_4208A0 of the file /goform/set_dmz of the component Configuration Handler. The manipulation of the argument dmz_host/dmz_enable results in os command injection. The attack can be executed 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-2026-2155?

It affects 1 product.

Products include Dlink Dir-823x Firmware.

How do I fix CVE-2026-2155?

No fix has been published for CVE-2026-2155 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-2026-2155 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2155 exists.

Sources

Also known as GHSA-gfgw-92mr-c3gr.