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CVE-2026-34123— Whitelist Validation Bypass in TP-Link Tapo C520WS

Quick assessment

Affected
TP-Link Systems Inc. Tapo C520WS v2
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存在安全漏洞，该漏洞源于设备API授权机制存在逻辑缺陷，可能导致攻击者利用合法方法映射行为绕过白名单限制，将受限操作伪装为允许请求执行，可能导致未授权的敏感操作，包括设备重置、意外配置更改或正常操作中断，导致设备可用性和完整性丧失。

AI Predicted 5.3 Difficulty: Easy EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1548.002 · Bypass User Account Control

Affected Version Matrix 1

VendorProduct Version RangeStatus
TP-Link Systems Inc. Tapo C520WS v2 < 1.2.6 Build 260528 affected
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I. Basic Information for CVE-2026-34123

Vulnerability Information
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Vulnerability Title
Whitelist Validation Bypass in TP-Link Tapo C520WS
Source: CVE Program / CVE List V5
Vulnerability Description
On Tapo C520WS v2, restricted accounts (for example, hub users) are intended to execute only a limited set of low‑sensitivity operations. Due to a logic flaw in the device’s API authorization mechanism, an attacker can craft requests that leverage legitimate “method mapping” behavior to bypass whitelist restrictions, allowing restricted operations to be masked as permitted requests and executed. Successful exploitation may allow an attacker (with access to a restricted account) to execute unauthorized sensitive operations.  Depending on the operation invoked, impact could include device resets, unintended configuration changes, or disruption of normal operation, leading to loss of availability and integrity of the device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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存在安全漏洞，该漏洞源于设备API授权机制存在逻辑缺陷，可能导致攻击者利用合法方法映射行为绕过白名单限制，将受限操作伪装为允许请求执行，可能导致未授权的敏感操作，包括设备重置、意外配置更改或正常操作中断，导致设备可用性和完整性丧失。
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 0 ~ 1.2.6 Build 260528 -

II. Public POCs for CVE-2026-34123

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III. Intelligence Information for CVE-2026-34123

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Vendor Advisories for CVE-2026-34123 (1)

Same Patch Batch · TP-Link Systems Inc. · 2026-06-05 · 6 CVEs total

CVE-2026-6240 Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C52
CVE-2026-6239 Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520
CVE-2026-6241 Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
CVE-2026-6242 Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520W
CVE-2026-8714 Denial-of-Service Vulnerability in RTSP Input Handling on TP-Link's Tapo C520WS

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34123

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