TP-Link Tapo C520WS v2 Configuration improper authentication

Summaryinfo

A vulnerability was found in TP-Link Tapo C520WS v2. It has been declared as critical. The impacted element is an unknown function of the component Configuration Handler. Executing a manipulation can lead to improper authentication. This vulnerability is handled as CVE-2026-34123. The attack can only be done within the local network. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in TP-Link Tapo C520WS v2 (version now known). This vulnerability affects some unknown processing of the component Configuration Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is available at tp-link.com. This vulnerability was named CVE-2026-34123 since 03/25/2026. The exploitation appears to be easy. Access to the local network is required for this attack to succeed. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• TP-Link

Name

• Tapo C520WS v2

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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CPE 2.2info

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