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