How severe is CVE-2021-31897?

CVE-2021-31897 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-31897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31897?

CVE-2021-31897 affects Jetbrains Webstorm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31897?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-31897 published?

CVE-2021-31897 was published on 2021-05-11 and last updated on 2026-06-17.

CVE-2021-31897

CVE-2021-31897 is a critical-severity vulnerability in Jetbrains Webstorm with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jetbrains Webstorm
Published: 2021-05-11
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-31897?: In JetBrains WebStorm before 2021.1, code execution without user confirmation was possible for untrusted projects.
How severe is CVE-2021-31897?: CVE-2021-31897 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-31897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31897?: CVE-2021-31897 affects Jetbrains Webstorm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31897?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-31897 published?: CVE-2021-31897 was published on 2021-05-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jetbrains:webstorm:*:*:*:*:*:*:*:*

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