# CVE-2026-64804: JetBrains WebStorm arbitrary code execution via project-local linters

Source: https://junglewise.ai/threats/cve-2026-64804-jetbrains-webstorm-arbitrary-code-execution-via-project-local  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-23. Updated: 2026-07-23  
License: CC BY 4.0 with a link back

CVE-2026-64804 · Severity: high · CVSS 8.4 · Published 2026-07-23

JetBrains WebStorm, a popular development environment for JavaScript and web technologies, was vulnerable to a security flaw that allowed malicious code to run automatically when opening a project. This could occur even before a user explicitly chose to 'trust' the project, potentially allowing an attacker to compromise a developer's workstation simply by having them open a malicious codebase. This poses a significant risk to intellectual property and local system security.

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

## Quick answers

**Is CVE-2026-64804 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-64804 being exploited in the wild.

**How severe is CVE-2026-64804?** High severity, with a CVSS score of 8.4, published 23 July 2026.

**Which products and versions are affected?** Jetbrains WebStorm before 2026.2.

**Is there a fix for CVE-2026-64804?** A patch was published on 2026-07-23: Fixed in version 2026.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-64804 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-64804?** 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.

## Technical details

A vulnerability in JetBrains WebStorm (classified as CWE-829: Inclusion of Functionality from Untrusted Control Sphere) allowed for arbitrary code execution when opening a project. The flaw exists in how the IDE handles project-local linter tooling, which could be triggered automatically before the user grants 'Project Trust.' An attacker could exploit this by placing malicious scripts or binaries within a project's local configuration that the IDE executes upon initialization. This is a local attack vector with high impact on confidentiality, integrity, and availability. The issue is resolved in WebStorm version 2026.2.

## Affected products

- JetBrains WebStorm before 2026.2

## Timeline

- 2026-07-23: advisory: CVE-2026-64804 published by JetBrains
- 2026-07-23: patched: Fixed in version 2026.2

## References

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

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