What is CVE-2026-34121?

CVE-2026-34121 is a high-severity vulnerability in Tp-link Tapo_c520ws, classified under Improper Authentication. CVSS score: 8.8/10. Published 2026-04-02.

How severe is CVE-2026-34121?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Tp-link Tapo_c520ws

CVE-2026-34121

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…

Vulnerability class: Broken Authentication

EPSS: 0.004 (36.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Tp-link Tapo_c520ws — versions 2.6
Tp-link Tapo_c520ws_firmware
Tp-link Systems Inc. Tapo C520ws V2.6 — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

f23511db-6c3e-4e32-a477-6aa17d310630 (Release Notes, patch)
f23511db-6c3e-4e32-a477-6aa17d310630 (Release Notes, patch)
f23511db-6c3e-4e32-a477-6aa17d310630 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34121?: CVE-2026-34121 is a high-severity vulnerability in Tp-link Tapo_c520ws, classified under Improper Authentication. CVSS score: 8.8/10. Published 2026-04-02.
How severe is CVE-2026-34121?: High severity. CVSS v3 base score is 8.8 out of 10.