CVE-2026-123855 in Toolbox App
Summary
by MITRE • 11/06/2026
In JetBrains Toolbox App before 3.6.1 command injection was possible via enterprise configuration URLs
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Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified in JetBrains Toolbox App prior to version 3.6.1 represents a critical security flaw rooted in improper neutralization of special elements used in an operating system command, commonly classified under CWE-78 as OS Command Injection. This specific weakness allows an attacker with the ability to influence enterprise configuration URLs to execute arbitrary commands on the host machine where the application is running. The JetBrains Toolbox App serves as a central hub for managing various JetBrains development tools, and its integration with enterprise environments often involves fetching configuration data from remote servers or internal repositories via specified URL endpoints. When the application processes these URLs without adequate sanitization or validation of user-controlled input within the command construction logic, it creates an avenue for malicious actors to inject shell metacharacters that alter the intended system behavior.
From a technical perspective, the flaw likely stems from how the application constructs internal commands to process configuration data retrieved from the provided URL. If the software directly concatenates or interpolates parts of the URL into a command string passed to the operating system's shell interpreter without rigorous escaping or parameterization, an attacker can craft a maliciously formatted URL containing payload sequences such as semicolons, pipes, or backticks. These characters allow the injection of additional commands that are executed with the privileges of the user running the JetBrains Toolbox App. This type of vulnerability is particularly dangerous because it bypasses application-level security controls by leveraging the underlying operating system's command execution capabilities, effectively granting the attacker a foothold on the target system through legitimate software functionality.
The operational impact of this vulnerability is severe, potentially leading to full system compromise depending on the privilege level of the user executing the Toolbox App. An adversary could exploit this flaw to download and execute malware, exfiltrate sensitive data stored locally by development tools, modify configuration files to persist access, or use the compromised machine as a pivot point for further attacks within an enterprise network. In corporate environments where JetBrains products are widely deployed, this vulnerability poses a significant risk because it targets infrastructure management software that often runs with elevated permissions or has broad access to project directories and credentials stored in local caches. The ability to execute commands remotely via configuration URLs means the attack can be automated and scaled across multiple endpoints if vulnerable configurations are distributed through enterprise deployment mechanisms.
Mitigation strategies primarily involve upgrading to JetBrains Toolbox App version 3.6.1 or later, where this command injection flaw has been addressed by implementing stricter input validation and secure coding practices for handling external URL inputs. Organizations should also enforce the principle of least privilege by ensuring that development tools run with minimal necessary permissions, thereby limiting the potential damage if an exploit is attempted. Additionally, network segmentation and monitoring can help detect anomalous outbound connections or unusual command executions originating from IDE-related processes. Security teams should review their enterprise configuration distribution methods to ensure that only trusted sources are allowed as valid endpoints for Toolbox App configurations, reducing the attack surface associated with dynamic URL fetching mechanisms. This incident underscores the importance of rigorous input validation in any software component that interacts with external data sources and executes system-level operations based on that data.