How severe is CVE-2021-32797?

CVE-2021-32797 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-32797 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32797?

CVE-2021-32797 affects Jupyter Jupyterlab. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32797?

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

When was CVE-2021-32797 published?

CVE-2021-32797 was published on 2021-08-09 and last updated on 2026-06-17.

CVE-2021-32797

CVE-2021-32797 is a high-severity vulnerability in Jupyter Jupyterlab with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 6.8
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jupyter Jupyterlab
Published: 2021-08-09
Last modified: 2026-06-17

Description

JupyterLab is a user interface for Project Jupyter which will eventually replace the classic Jupyter Notebook. In affected versions untrusted notebook can execute code on load. In particular JupyterLab doesn’t sanitize the action attribute of html `<form>`. Using this it is possible to trigger the form validation outside of the form itself. This is a remote code execution, but requires user action to open a notebook.

Frequently asked questions

What is CVE-2021-32797?: JupyterLab is a user interface for Project Jupyter which will eventually replace the classic Jupyter Notebook. In affected versions untrusted notebook can execute code on load. In particular JupyterLab doesn’t sanitize the action attribute of html `<form>`. Using this it is possible to trigger the form validation outside of the form itself. This is a remote code execution, but requires user action to open a notebook.
How severe is CVE-2021-32797?: CVE-2021-32797 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-32797 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32797?: CVE-2021-32797 affects Jupyter Jupyterlab. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32797?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-32797 published?: CVE-2021-32797 was published on 2021-08-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*

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