External risk intelligence

JetBrains IntelliJ IDEA Remote Development Unauthorized Input Injection

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-64812

The vulnerability affects a Remote Development session within an IDE. While network-reachable, IDE remote development features are typically used in controlled, authenticated, or internal developer environments rather than being exposed directly to the public internet by design.

Missing Authentication

Jetbrains Intellij Idea

before 2026.2

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

An unauthenticated input injection vulnerability exists in JetBrains IntelliJ IDEA's Remote Development sessions. This means an unauthorized party could potentially inject commands or data into a remote session. The primary concern at this stage is to confirm if your organization uses this specific feature, as the impact can be significant if it is exploited.

Unauthorized commands can be injected into remote development sessions.
Understand if your developers use this specific feature.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by initiating an unauthenticated connection to a vulnerable Remote Development session. By injecting specially crafted input, they could then compromise the integrity and confidentiality of the system and potentially execute arbitrary code.

Unauthenticated remote access required.
Inject malicious input into the session.
Complete system compromise is possible.

Live Threat

Current exploitation, exposure, and threat context

A critical vulnerability in JetBrains IntelliJ IDEA's Remote Development sessions could allow an unauthenticated attacker to inject unauthorized input. This could potentially lead to severe impacts on the affected system and its data when the remote development feature is accessible.

Remote Development session data and system.
Unauthorized input injection.
System compromise and data corruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

The presence of unauthorized input injection in JetBrains IntelliJ IDEA's Remote Development sessions necessitates immediate attention from teams responsible for development platforms and security. The first practical step is to identify all instances of the affected technology within the organization, confirm their accessibility from external networks, and ascertain their business criticality to prioritize remediation efforts effectively. This may involve coordinating with application owners and potentially the vendor if direct fixes are not immediately available.

Development platform or security teams own the issue.
Verify exposure and business criticality of instances.
Plan remediation or vendor coordination for fixes.

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.

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Frequently asked questions

What is JetBrains IntelliJ IDEA?

IntelliJ IDEA is a widely used integrated development environment (IDE) designed for software engineers. It includes advanced features like Remote Development, which allows developers to host their coding environments on servers or cloud machines rather than their local laptops, enabling collaboration and access to more powerful computing resources.

What does CWE-306 mean for CVE-2026-64812?

This vulnerability is classified as CWE-306, which refers to Missing Authentication for Critical Function. In the context of this CVE, it means the software performs an action or accepts input that should be restricted to verified users, but it fails to check the identity of the person sending the data. Because this check is missing, an unauthorized user can interact with a remote development session as if they were the legitimate developer.

How can an attacker trigger this input injection?

An attacker initiates this by connecting directly to an active, vulnerable Remote Development session without providing any valid credentials. It is important to note that simply running the IntelliJ IDEA IDE locally on a workstation does not trigger this issue; the vulnerability is specific to the active network-based Remote Development feature itself.

Is my development environment at risk?

According to Halo Surface Signal, this risk is generally unlikely if your environment is configured correctly. While the vulnerability is technically reachable over a network, Remote Development features are typically hosted in restricted, internal, or authenticated infrastructure. You should be most concerned if these specific session ports are unintentionally exposed to the public internet.

What should I do if I use Remote Development?

Your first step is to perform an inventory of all systems running IntelliJ IDEA to identify where the Remote Development feature is active. Once located, verify if these instances are accessible from outside your internal network. Coordinate with your development teams to confirm their usage, ensure they are updated to the latest vendor-provided versions, and restrict access to these sessions to authorized users only.

References

www.jetbrains.com/privacy-security/issues-fixed/

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.