External risk intelligence

Tenda AC1206 Missing Authentication in Web UI.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-82694

The vulnerability affects the Web UI of a Tenda router, specifically an authentication handler. Network-facing management interfaces on edge routing devices are designed to be accessible and often face the public internet or are directly reachable in their default deployment configuration.

Authentication Bypass

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Tenda's AC1206 router impacting its Web UI component, allowing for remote exploitation due to missing authentication. This issue is publicly available and may be actively exploited.

Missing authentication in router's web interface.
Affects widely accessible network devices.
Confirm relevance and exposure of affected devices.

Attack Path

How an attacker could exploit the issue

An attacker can remotely access the router's web interface and trigger the vulnerability without any authentication. This occurs when the attacker interacts with the `R7WebsSecurityHandler` function in the `/goform/ate` file. Successful exploitation could lead to a complete compromise of the affected component.

No authentication required to reach the vulnerability.
Vulnerability triggered via the `/goform/ate` endpoint.
Risk of missing authentication and unauthorized access.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in the Web UI of a Tenda router could allow an unauthenticated attacker to bypass security controls. This could occur when the affected function is accessed remotely over the network.

Router authentication and configuration data.
Remotely accessing the affected Web UI function.
Unauthorized system access and control.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Web UI component of the Tenda AC1206 is affected by a missing authentication vulnerability. This issue is remotely exploitable and the exploit is publicly available, indicating a high likelihood of active exploitation. The primary responsibility for addressing this vulnerability likely falls to the infrastructure or network security teams responsible for managing edge devices and ensuring their secure configuration. The first practical step is to identify all instances of the Tenda AC1206 within the environment, assess their exposure (particularly any internet-facing interfaces), and determine business criticality to prioritize remediation efforts.

Infrastructure or network security teams own the issue.
Verify device exposure and criticality.
Plan and coordinate remediation actions.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Tenda AC1206 router?

The Tenda AC1206 is a network routing device designed to manage internet connectivity and local network traffic. It includes a built-in Web UI, which is a browser-based management interface that allows administrators to configure network settings, security policies, and system preferences. This device serves as a bridge between the internet and internal devices, making its security critical for preventing unauthorized network control.

What does CVE-2026-82694 mean by missing authentication?

This vulnerability, classified as CWE-306 (Missing Authentication for Critical Function), means the router fails to verify who is trying to access a sensitive management function. Normally, a password or session token is required to change device settings. Because of this flaw, the router accepts commands from anyone who reaches the affected endpoint without checking their identity first, effectively bypassing the security controls designed to protect the administration interface.

How is this vulnerability triggered?

An attacker triggers the vulnerability by sending a network request directly to the `/goform/ate` endpoint. The flaw exists within the `R7WebsSecurityHandler` function, which fails to gate access to the underlying logic. It is important to note that this requires network connectivity to the device; simply using the router for standard web browsing or local traffic does not trigger the bug, but interacting with this specific administrative URL does.

How do I know if my device is relevant?

According to Halo Surface Signal, this vulnerability is very likely to be a concern if the router is an edge device with its management interface reachable from the internet. Because these routers are often placed at the perimeter of a network, their Web UIs may be exposed to public traffic. You should prioritize checking devices that are directly accessible from the internet or reachable from untrusted network segments.

What should I do first to respond to this issue?

Begin by creating an inventory of all Tenda AC1206 units currently in use across your environment. Once identified, inspect their network configuration to determine if the management interface is exposed to the internet. If you find exposed devices, restrict access to the Web UI to trusted internal management networks only while you coordinate with your team to review official security updates or manufacturer-recommended configurations.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.