CVE-2026-11409 OS Command Injection in IPv6 PPPoE Configuration in TP-Link TL-WR940N

High 8.5 Published 16 Jun 2026 Updated 18 Jun 2026

Authenticated attackers can execute arbitrary system commands with elevated privileges via improper input sanitization in the IPv6 PPPoE configuration handler.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-11409?

CVE-2026-11409 is a high-severity command injection vulnerability in TP-Link Systems Inc. TL-WR940N v6, published on 16 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of user input. An attacker with administrative access may exploit this issue to execute arbitrary system commands with elevated privileges.

Weakness: CWE-78

Which versions are affected by CVE-2026-11409?

It affects 1 product.

Products include Tp-Link Tl-Wr940n Firmware.

How do I fix CVE-2026-11409?

No fix has been published for CVE-2026-11409 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-2026-11409 being exploited?

There is no known exploitation of CVE-2026-11409 in the wild and no public exploit code.

Sources

Also known as GHSA-xwmq-379c-mhf5.