CVE-2026-108336: Critical Flaw in Hitachi Vantara Remot Ops Agent Allows Token Forgery for Admin Access

An attacker can bypass the login screen for Hitachi Vantara Remot Ops Agent and gain full administrative control. This happens when the application uses its default self-signed SSL certificate. The flaw, identified as CVE-2026-108336, allows anyone to create valid access tokens. These tokens convince the system that the user is authorized. The issue affects all versions of the agent up to 2.0.

In plain English

The web interface for this agent uses digital certificates to prove identity. Normally, only the server can create valid login tokens. However, if the server is using the default certificate, an attacker could have the capability to sign JWT access tokens. The application accepts these tokens as legitimate. This grants the attacker the same rights as a logged-in administrator. The source material states this allows bypassing login.

The background

The National Vulnerability Database lists this issue as Critical. It carries a CVSS score of 9.1. The weakness falls under CWE-321, which relates to generation of predictable values. The flaw is inherent in how the agent handles its default security setup. It depends on the use of the default SSL certificate. The attacker could gain administrative access to the application.

What changes now

Administrators with this agent installed must verify their certificate configuration. If the default self-signed certificate is still in use, the system is vulnerable. Attackers can perform administrative actions like configuring the service. They can also request log collection from the device. However, the vulnerability has limits. Attackers cannot access device credentials. They also cannot reach customer data stored on the system.

What made it possible

This scenario illustrates the risk of relying on default cryptographic configurations. When systems use pre-installed certificates, the signing keys are often predictable or publicly known. This breaks the trust model for token validation. Security teams usually audit certificate deployments during hardening phases. They check whether unique, private keys are generated for each instance. If defaults remain, token forgery becomes trivial. This technique serves the initial access stage of an intrusion, allowing attackers to establish a foothold without valid credentials.

What to do and how to stay safe: Hitachi Vantara

• Check if your Hitachi Vantara Remot Ops Agent is using the default self-signed certificate.
• Replace the default certificate with a unique, privately signed certificate immediately.
• Monitor administrative logs for unexpected configuration changes or log requests.
• Verify that no unauthorized tokens are being generated or accepted by the system.

Step-by-step guide: Automatic Updates Mistakes That Leave Systems Exposed

General security guidance from the RedTeam Monitor newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Does this vulnerability allow attackers to steal customer data?

No, the National Vulnerability Database states that device credentials and customer data cannot be accessed with this vulnerability.

Which versions of Hitachi Vantara Remot Ops Agent are affected?

The flaw affects all versions of the Hitachi Vantara Remot Ops Agent up to and including version 2.0.

What is the severity rating of CVE-2026-108336?

The vulnerability is rated Critical with a CVSS score of 9.1 according to the NVD record.