TP-Link Deco up to 3.6 Mesh improper authorization

Summaryinfo

A vulnerability, which was classified as very critical, was found in TP-Link Deco up to 3.6. This affects an unknown function of the component Mesh. Executing a manipulation can lead to improper authorization. This vulnerability is tracked as CVE-2026-15469. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in TP-Link Deco up to 3.6. This vulnerability affects some unknown functionality of the component Mesh. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The use of hard-coded cryptographic key vulnerability has been identified in the mesh functionality of Deco XE75 v3, XE5300 v3.6 and WE10800 v3.6.  A shared RSA-512 mesh group private key is present in the affected firmware and is used by the mesh protocol for node authentication.  An attacker who obtains the firmware image and has local network access may be able to authenticate as a mesh node without possessing a device-specific credential. Successful exploitation may allow an unauthenticated adjacent attacker to impersonate a trusted mesh node and bypass mesh node authentication, which may permit unauthorized changes to device or mesh configuration, affecting confidentiality, integrity and availability.

The advisory is shared for download at tp-link.com. This vulnerability was named CVE-2026-15469 since 07/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/24/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

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-2026-64936). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• TP-Link

Name

• Deco

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Once again VulDB remains the best source for vulnerability data.

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