External risk intelligence

EFM ipTIME T16000M Improper Authentication Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-78167

The vulnerability affects a network-facing session validation handler in an ipTIME router, which is a consumer-grade edge device typically deployed as the primary internet-facing gateway for a network.

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 ipTIME routers related to how they handle user sessions. This weakness could allow attackers to bypass authentication remotely, potentially leading to unauthorized access and control of affected devices. Given the widespread use of these devices as network gateways, this issue warrants attention to understand its relevance to our environment.

Weak session handling in routers is exploitable.
Routers are the network's primary entry point.
Confirm relevance and assess exposure.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability remotely by reaching the Session Validation Handler through the network. Once access is gained, the attacker can manipulate the `httpcon_check_session_url` function. This manipulation could lead to improper authentication, potentially allowing the attacker to bypass security measures and gain unauthorized access or control.

No authentication or network access required.
Manipulate session validation function.
Leads to improper authentication.

Live Threat

Current exploitation, exposure, and threat context

A weakness in the Session Validation Handler could allow remote attackers to bypass authentication when they interact with the affected device. This could potentially lead to unauthorized access and manipulation of the device's functions.

Unauthorized access to device functions.
Remote exploitation is possible.
Compromised device security and control.

Operational Fix

Recommended remediation, mitigation, and detection steps

The identified vulnerability in EFM ipTIME T16000M's session validation handler presents a critical risk due to its exploitable nature over the network. Given that the vendor has not responded, network and security teams are likely responsible for initial triage. The first practical step is to identify all instances of this device, determine their exposure and business criticality, and then coordinate a risk-based remediation plan.

Network and security teams own this.
Verify device exposure and criticality.
Plan and execute containment/remediation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is the EFM ipTIME T16000M?

The EFM ipTIME T16000M is a networking device designed to manage internet connectivity and data traffic. It serves as a gateway that facilitates communication between local devices and the broader internet. Because it handles routing and session management, it sits at the edge of the network, acting as the primary point through which traffic enters and exits the local environment.

What does CVE-2026-78167 mean for system security?

CVE-2026-78167 relates to a class of vulnerability known as Improper Authentication (CWE-287). Specifically, a component responsible for verifying user sessions fails to correctly validate the identity of those attempting to connect. This weakness allows an attacker to bypass security checks that would normally prevent unauthorized users from interacting with the device's administrative functions or internal controls.

How do attackers trigger this vulnerability?

An attacker triggers this flaw by interacting with the Session Validation Handler over the network. The vulnerability exists within a specific function, httpcon_check_session_url, which fails to gate access properly. Critically, no user credentials or prior network permissions are required to initiate this attempt; the device accepts the malicious interaction without demanding proof of identity, effectively granting the attacker unauthorized entry.

Why is this CVE high-risk for my network?

Halo Surface Signal indicates this is a high-priority concern because the affected component is a network-facing gateway. Since these routers are typically deployed as the primary bridge to the internet, they are naturally exposed. If an attacker can reach the router's management interface from the internet, they may bypass authentication entirely, placing your network's primary gateway under their control.

What are the first steps to manage this risk?

Since there is currently no vendor update, focus on identification and containment. Start by inventorying your environment to locate all instances of the T16000M. Determine which devices are reachable from the internet versus those only accessible internally. Prioritize restricting access to the administrative interfaces of these devices, ensuring they are not exposed to untrusted networks while you evaluate further mitigation or replacement options.

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.