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CVE-2026-34121— Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS

Quick assessment

Affected
TP-Link Systems Inc. Tapo C520WS v2.6
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2.6版本存在安全漏洞，该漏洞源于DS配置服务的HTTP处理中身份验证检查期间JSON请求的解析和授权逻辑不一致，可能导致身份验证绕过，进而未经授权修改设备状态。

AI Predicted 9.8 Difficulty: Easy EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2026-34121

Vulnerability Information
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Vulnerability Title
Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link Tapo C520WS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2.6版本存在安全漏洞，该漏洞源于DS配置服务的HTTP处理中身份验证检查期间JSON请求的解析和授权逻辑不一致，可能导致身份验证绕过，进而未经授权修改设备状态。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TP-Link Systems Inc. Tapo C520WS v2.6 0 ~ 1.2.4 Build 260326 Rel.24666n -

II. Public POCs for CVE-2026-34121

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III. Intelligence Information for CVE-2026-34121

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Vendor Advisories for CVE-2026-34121 (1)

Same Patch Batch · TP-Link Systems Inc. · 2026-04-02 · 6 CVEs total

CVE-2026-34118 7.1 HIGH Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C100
CVE-2026-34119 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520
CVE-2026-34124 Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WS
CVE-2026-34122 Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS
CVE-2026-34120 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520

IV. Related Vulnerabilities

Same product: Tapo C520WS v2.6
Same vendor: TP-Link Systems Inc.
Same weakness: CWE-287

V. Comments for CVE-2026-34121

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