CVE-2026-34121: TP-Link Tapo c520ws Firmware

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.

Affected products

• TP-Link Tapo c520ws Firmware: before 1.2.4 (fixed in 1.2.4)

Published 2026-04-02. Last modified 2026-07-24.