TP-Link Kasa v4 Web Management Service channel accessible

Summaryinfo

A vulnerability has been found in TP-Link Kasa v4 and classified as problematic. This impacts an unknown function of the component Web Management Service. Performing a manipulation results in channel accessible. This vulnerability is cataloged as CVE-2026-9770. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in TP-Link Kasa v4. This affects an unknown part of the component Web Management Service. The manipulation with an unknown input leads to a channel accessible vulnerability. CWE is classifying the issue as CWE-300. The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint. This is going to have an impact on confidentiality. The summary by CVE is:

Kasa EC71 v4 and EC70 v4 firmware contains a static cryptographic private key stored in a read-only filesystem that is shared across devices.  An attacker with access to the firmware image can extract the embedded key.  Successful exploitation may allow an unauthenticated attacker on the same network to use this key in the web management service, compromising the confidentiality of encrypted communications. This may enable passive decryption of traffic or active man-in-the-middle (MITM) attacks

It is possible to read the advisory at tp-link.com. This vulnerability is uniquely identified as CVE-2026-9770 since 05/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/15/2026). The attack technique deployed by this issue is T1557 according to MITRE ATT&CK.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44576). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• TP-Link

Name

• Kasa

Version

• v4

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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