What is CVE-2021-31897?

CVE-2021-31897 is a critical-severity vulnerability in Jetbrains Webstorm. CVSS score: 9.8/10. Published 2021-05-11.

How severe is CVE-2021-31897?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Jetbrains Webstorm

CVE-2021-31897

In JetBrains WebStorm before 2021.1, code execution without user confirmation was possible for untrusted projects.

Published 2021-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (74.7th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Jetbrains Webstorm

References

blog.jetbrains.com (Vendor Advisory)
blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-31897?: CVE-2021-31897 is a critical-severity vulnerability in Jetbrains Webstorm. CVSS score: 9.8/10. Published 2021-05-11.
How severe is CVE-2021-31897?: Critical severity. CVSS v3 base score is 9.8 out of 10.