CVE-2026-123322 in WebStorm
Summary
by MITRE • 11/06/2026
In JetBrains WebStorm before 2026.3, 2026.2.4 code execution was possible in untrusted projects via the Angular CLI schematics loader
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Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified in JetBrains WebStorm prior to version 2026.3 represents a critical security flaw within the integrated development environment's handling of project configurations, specifically targeting the Angular CLI schematics loading mechanism. This issue stems from an improper restriction on code execution when processing untrusted or externally sourced projects. The core technical deficiency lies in how the IDE parses and executes schematic definitions during the initialization phase of an Angular-based workspace. Schematics are essentially transformation scripts written in TypeScript that allow developers to automate common tasks such as generating components, modifying project structures, or applying updates. While these tools are designed for legitimate development workflows, their execution engine within WebStorm failed to adequately sandbox or validate the integrity and origin of the schematic code before running it against the local file system and environment variables.
This lack of strict validation allows an attacker who can trick a developer into opening a malicious project archive to achieve arbitrary remote code execution on the host machine. The operational impact is severe because developers often open projects from various sources, including public repositories, client submissions, or third-party libraries without rigorous security auditing at the IDE level. When such a compromised project is opened in WebStorm, the integrated Angular CLI tooling automatically attempts to load and apply schematics defined in the project's configuration files. Because the environment does not distinguish between trusted internal code and potentially malicious external inputs during this specific loading process, any arbitrary JavaScript or TypeScript payload embedded within these schematic definitions will be executed with the privileges of the currently logged-in user account.
From a classification perspective, this vulnerability aligns closely with CWE-94, which describes Improper Control of Generation of Code (Code Injection), as well as CWE-78, pertaining to Operating System Command Injection if shell commands are invoked through the schematic execution context. In terms of adversary tactics and techniques, this flaw facilitates the ATT&CK technique T1059, specifically command scripting interpretation via JavaScript or TypeScript engines embedded within the development toolchain. The attack vector is primarily local but can be triggered remotely by distributing a malicious project file that exploits the IDE's trust model regarding its own plugin ecosystem and integrated CLI tools.
Mitigation strategies for this vulnerability are twofold: immediate patching and operational best practices. JetBrains has addressed this issue in WebStorm version 2026.3 and subsequent updates, which implement stricter sandboxing protocols and input validation checks within the Angular schematics loader to prevent unauthorized code execution from untrusted sources. Organizations relying on older versions of the IDE must upgrade immediately upon availability. Additionally, developers should adopt a zero-trust approach when opening projects obtained from external parties or public repositories that have not been previously vetted for security integrity. Utilizing isolated virtual machines or containers for testing unknown codebases can further mitigate the risk of local system compromise while maintaining development productivity standards.