CVE-2026-89052

Medium

Description

A hardcoded cryptographic key management vulnerability exists in Archer C6 due to the use of a universal cryptographic key shared across devices. An attacker who obtains an encrypted configuration file or other protected credential data can recover plaintext credentials. Successful exploitation may allow unauthorized disclosure of sensitive information, including administrative credentials.

SeverityMedium

CVSS5.9

Exploit probability—

ProductArcher C6 V2

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-321CWE-321

How to fix

Update

TP-Link Systems Inc. Archer C6 V21.2.1 Build 260902 or later

Patches

tp-link.com/us/support/download/archer-c6/v2/#Firmware

Vendor advisories

tp-link.com/us/support/faq/5356/

Affected products

Product	Affected versions	Fixed in
TP-Link Systems Inc. Archer C6 V2	v < 1.2.1 Build 260902	1.2.1 Build 260902

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