CVE-2026-86502 in IntelliJ IDEA
Summary
by MITRE • 09/07/2026
In JetBrains IntelliJ IDEA before 2026.2.2 missing TLS and authentication on the IJent gRPC server allowed local code execution on Remote Development hosts
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Analysis
by VulDB Data Team • 09/07/2026
The vulnerability identified in versions of JetBrains IntelliJ IDEA prior to version 2026.2.2 stems from a critical architectural oversight within the remote development infrastructure, specifically concerning the inter-process communication mechanism known as IJent gRPC server. This component is responsible for facilitating data exchange between the local IDE instance and the remote host environment where code execution occurs. In affected versions, this internal service was configured without enforcing Transport Layer Security (TLS) encryption or requiring authentication mechanisms to validate incoming requests. Consequently, any process running on the same operating system as the IntelliJ IDEA application could interact with this gRPC endpoint directly, bypassing all intended security controls designed to isolate local and remote environments.
From a technical perspective, the absence of TLS means that data transmitted between components is sent in plaintext, allowing for potential interception or manipulation if network boundaries are breached, although the primary risk here is localized. More critically, the lack of authentication implies that there was no mechanism to verify the identity or privileges of the client initiating requests against the gRPC server. This design flaw effectively treats all local processes as trusted entities with unrestricted access to sensitive internal APIs. An attacker who has achieved even minimal code execution capabilities on the host machine can exploit this open channel to invoke administrative functions, manipulate project configurations, or execute arbitrary commands within the context of the remote development session.
The operational impact of this vulnerability is severe, particularly in enterprise environments where developers may run multiple tools simultaneously or share workstations with other users. Since the flaw allows for local code execution on Remote Development hosts, a malicious actor could escalate privileges by leveraging trusted applications that have access to the IDE process memory space. This could lead to unauthorized data exfiltration, modification of source code repositories, or complete compromise of the development environment. The risk is amplified in scenarios where developers use shared machines or automated build systems that might inadvertently expose local services without proper isolation boundaries.
This vulnerability aligns with CWE-287, which describes Improper Authentication, as well as CWE-319 regarding Cleartext Transmission of Sensitive Information within a Single Logical Boundary. In the context of the MITRE ATT&CK framework, this flaw facilitates lateral movement and privilege escalation techniques by allowing an attacker to abuse trusted processes for command execution without detection. The exploitation path typically involves identifying local services exposed via gRPC ports or sockets and crafting specific protocol messages that trigger unintended behavior within the IDE backend logic.
To mitigate this risk, organizations must ensure that all instances of IntelliJ IDEA are updated to version 2026.2.2 or later, where these security controls have been implemented. Administrators should also enforce strict host-based firewall rules to restrict access to development ports if remote connectivity is not explicitly required for legitimate operations. Additionally, implementing application whitelisting and monitoring local process activity can help detect attempts to interact with unauthorized gRPC endpoints. Regular audits of IDE configurations are recommended to ensure that no custom plugins or extensions reintroduce similar insecure communication patterns in future updates.