CVE-2026-109506: Improper Authentication in Multiple TP-Link WiFi Repeaters
Multiple TP-Link Wi-Fi range extenders use a custom, reversible XOR-and-dictionary transformation in the HTTP web-management login flow. An unauthenticated attacker on the same local network who can capture the network traffic associated with legitimate administrator login may be able to derive an alternative credential value that produces the same accepted authentication result and use it to authenticate to the device’s web-management interface with administrator privileges. Exploitation requires the management login to use HTTP and the attacker to observe the session key, dictionary, and login value associated with a legitimate administrator login.
Successful exploitation may allow an unauthenticated adjacent attacker to gain administrator access to the affected device and modify exposed configuration settings.
Affected Software
Event History
Frequently Asked Questions
Who is realistically able to exploit this issue?
An unauthenticated attacker must be on the same local network as the range extender and able to capture traffic from a legitimate administrator login. Remote-only attackers are not described as being able to exploit it.
What information must an attacker observe to authenticate successfully?
The attacker needs to observe the session key, dictionary, and login value associated with a legitimate administrator login. The described attack applies when the management login uses HTTP.
Is an administrator password alone enough to prevent exploitation?
No. The issue concerns the reversible transformation used by the HTTP login flow, which may let an attacker derive an alternative credential value that the device accepts after observing a legitimate login.
What could an attacker do after successful exploitation?
Successful exploitation may grant administrator access to the device's web-management interface. An attacker could then modify configuration settings exposed through that interface.