External risk intelligence

HotGo Authentication Bypass Allows Account Takeover Via SMS Code Manipulation.

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-120447

The vulnerability exists in an administrative login and SMS verification interface. Such application components are commonly exposed as internet-facing web endpoints to facilitate remote access for users and administrators, making them reachable in typical web application deployments.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in HotGo software allows attackers to bypass authentication and take over user accounts, including administrative ones. This occurs when an attacker can manipulate the SMS verification code process to gain unauthorized access to sensitive information and system controls. The main concern is to confirm if our environment utilizes this specific software and is therefore exposed.

Allows unauthorized account takeover.
Affects administrative and user access.
Confirm usage and exposure.

Attack Path

How an attacker could exploit the issue

An attacker can bypass authentication by knowing a user's mobile number and then manipulating the SMS verification code sent to that number. This allows the attacker to log in as any user, including administrators, gaining full account control.

Attackers need user's mobile number.
Attacker sets SMS verification code.
Unauthorized account takeover.

Live Threat

Current exploitation, exposure, and threat context

An authentication bypass vulnerability exists in HotGo, affecting systems that use its SMS login feature. This flaw allows an unauthenticated attacker who knows a user's mobile number to bypass verification by supplying a predetermined code. This could lead to unauthorized account takeovers, including those of administrative users.

User accounts and administrative access.
Bypassing SMS verification with a known code.
Unauthorized account takeover.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the HotGo administrative interface likely requires action from application owners and platform teams. The first step is to identify all instances of the affected technology, determine their exposure and business criticality, and then confirm the accountable owner for each instance to plan remediation.

Application owners must address the issue.
Verify administrator account reachability and exposure.
Plan remediation or implement mitigating controls.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is HotGo and why do people use it?

HotGo is a web-based application framework often utilized to build administrative management systems and back-end platforms. It provides developers with ready-made modules for common tasks like user authentication and notification management, allowing teams to deploy functional business software more quickly.

What does CVE-2026-120447 mean for security?

This CVE represents an Improper Authentication vulnerability, categorized as CWE-287. In simple terms, it means the software fails to properly verify the identity of someone trying to log in. Because the system trusts a verification code supplied by the user during the login process, an attacker can influence that process to fake a successful authentication.

How can an attacker trigger this vulnerability?

An attacker needs a target's mobile phone number to trigger this flaw. By interacting with a specific API endpoint responsible for sending SMS messages, the attacker can force the system to use a verification code of their choosing. This bug is not triggered by simply visiting the login page; it requires the attacker to actively supply this forged code to the system to complete the bypass.

Is my instance of HotGo at risk?

According to Halo Surface Signal, this vulnerability is likely to be a concern if your HotGo deployment includes administrative or SMS login interfaces that are reachable from the internet. Because these components are frequently exposed as web endpoints to allow for remote access, they are prime targets for external attackers looking to exploit this authentication flaw.

What should I do if I run HotGo?

Start by identifying every instance of HotGo running in your environment to determine which ones are critical. Once located, verify if these instances have the affected SMS authentication feature enabled and if they are accessible from external networks. Coordinate with your application owners to prioritize these systems for remediation or to apply compensating network controls.

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.