CVE-2026-34123
Whitelist Validation Bypass in TP-Link Tapo C520WS
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.
INFO
Published Date :
June 6, 2026, 12:16 a.m.
Last Modified :
July 23, 2026, 7:10 a.m.
Remotely Exploit :
No
Source :
f23511db-6c3e-4e32-a477-6aa17d310630
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 |
Solution
- Apply firmware updates to the Tapo C520WS v2 device.
- Verify that restricted accounts can only perform permitted operations.
- Implement stricter API access controls.
- Review and sanitize all API requests.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34123.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34123 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34123
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34123 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34123 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Tapo C520WS v2 de TP-Link Systems, Description: En Tapo C520WS v2, las cuentas restringidas (por ejemplo, usuarios del hub) están destinadas a ejecutar solo un conjunto limitado de operaciones de baja sensibilidad. Debido a un fallo lógico en el mecanismo de autorización de la API del dispositivo, un atacante puede elaborar solicitudes que aprovechan el comportamiento legítimo de 'mapeo de métodos' para eludir las restricciones de la lista blanca, permitiendo que las operaciones restringidas se enmascaren como solicitudes permitidas y se ejecuten. La explotación exitosa puede permitir a un atacante (con acceso a una cuenta restringida) ejecutar operaciones sensibles no autorizadas. Dependiendo de la operación invocada, el impacto podría incluir restablecimientos del dispositivo, cambios de configuración no deseados o interrupción del funcionamiento normal, lo que lleva a la pérdida de disponibilidad e integridad del dispositivo. -
CVE Modified by f23511db-6c3e-4e32-a477-6aa17d310630
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'TP-Link Systems Inc.', 'product': 'Tapo C520WS v2', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '1.2.6 Build 260528', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34123', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-08T13:06:49.208336Z'} -
New CVE Received by f23511db-6c3e-4e32-a477-6aa17d310630
Jun. 06, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-287 Added Reference https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes Added Reference https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes Added Reference https://www.tp-link.com/us/support/faq/5120/