Security Advisory: Referer Validation Bypass in TL-WR820N Web Management Interface (CVE-2026-15141)

Vulnerability and Impact Description:

CVE-2026-15141

The web interface of the affected device relies on the HTTP referrer header as part of request validation. Requests containing empty Referer value, or omitting the Referer header entirely, may be accepted and processed due to insufficient validation logic.

Successful exploitation may allow an adjacent attacker with access to the web management interface to obtain device configuration details and other sensitive information.

CVSS v4.0 Score: 5.3 / Medium

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Affected Products/Versions and Fixes:

Recommendations:

We strongly recommend that users with affected devices take the following actions:

1. Update affected devices to the latest firmware version that fixed the vulnerability:

EN: Download for TL-WR820N | TP-Link

KR: Download TL-WR820N | TP-Link South Korea

Note: TL-WR820N is not sold in the US.

Disclaimer:

This advisory is provided for informational purposes only and is subject to change without notice. The information is provided “as is” without warranties of any kind. TP-Link recommends that customers promptly apply available firmware updates or implement documented workarounds as provided in this advisory. Devices/systems that are not updated or mitigated as described may remain vulnerable, and TP-Link disclaims any responsibility or liability for any damages or losses arising from a failure to implement such updates.