What’s Vulnerable › Vulnerabilities

CVE-2026-15141: Referer Validation Bypass in TL-WR820N Web Management Interface

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-10-23
• Weakness: CWE-346

Description

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.

Affected products

• TP-Link Systems Inc. TL-WR820N v2: before 1.15.20 — fixed in 1.15.20

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. TL-WR820N v2 1.15.20. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/en/support/download/tl-wr820n/#Firmware
• https://www.tp-link.com/en/support/faq/5243/
• https://www.tp-link.com/kr/support/download/tl-wr820n/#Firmware

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