# CVE-2026-123321: JetBrains WebStorm code execution in Grunt and Gulp task loading

Source: https://junglewise.ai/threats/cve-2026-123321-in-jetbrains-webstorm-before-2026-3-2026-2-3-code-execution-via  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-123321 · Severity: high · CVSS 7.8 · Published 2026-11-06

JetBrains WebStorm is an IDE for web development that supports task automation tools like Grunt and Gulp. When opening untrusted projects, WebStorm could execute arbitrary code during task loading, allowing attackers to compromise a developer's machine through a malicious project.

Technologies: [Jetbrains WebStorm](https://junglewise.ai/threats/technologies/webstorm). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-123321 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123321 being exploited in the wild.

**How severe is CVE-2026-123321?** High severity, with a CVSS score of 7.8, published 6 November 2026.

**Which products and versions are affected?** Jetbrains WebStorm before 2026.3, 2026.2.3.

**Is there a fix for CVE-2026-123321?** Yes: fixed in WebStorm 2026.3, 2026.2.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-123321 attacked?** It is attacked with local access, in a web application.

**Am I affected by CVE-2026-123321?** Check whether you run Jetbrains WebStorm at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in WebStorm 2026.3, 2026.2.3

## Technical details

The vulnerability allows arbitrary code execution when WebStorm loads Grunt or Gulp tasks from untrusted projects. An attacker can craft a malicious project with task definitions that execute arbitrary code when opened in vulnerable versions of WebStorm. The attack requires a user to open a malicious project in the IDE.

## Affected products

- JetBrains WebStorm before 2026.3, 2026.2.3

## Timeline

- 2026-11-06: disclosed

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

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