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.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 02 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
Weaknesses CWE-287
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: TPLink

Published:

Updated: 2026-04-02T17:58:52.376Z

Reserved: 2026-03-25T18:54:03.343Z

Link: CVE-2026-34121

cve-icon Vulnrichment

Updated: 2026-04-02T17:58:47.830Z

cve-icon NVD

Status : Received

Published: 2026-04-02T18:16:28.990

Modified: 2026-04-02T18:16:28.990

Link: CVE-2026-34121

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses