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

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-17 · updated 2026-10-26
Weakness: CWE-78

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.

Affected products

TP-Link TL-WR940N: before 260528 — fixed in 260528

How to fix

Upgrade to a fixed version: TP-Link TL-WR940N 260528. Check the vendor advisory for mitigations.

References

https://www.tp-link.com/en/support/download/tl-wr940n/v6/#Firmware
https://www.tp-link.com/us/support/download/tl-wr940n/v6/#Firmware
https://www.tp-link.com/us/support/faq/5131/

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