CVE-2021-32797: PYSEC-2026-688 - JupyterLab: XSS due to lack of sanitization of the action attribute of an html <form>

Quick answers

Is CVE-2021-32797 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2021-32797 being exploited in the wild.

How severe is CVE-2021-32797?

Low severity, with a CVSS score of 3.1, published 2 July 2026.

Which products and versions are affected?

jupyterlab (PyPI) ECOSYSTEM:introduced=0,fixed=1.2.21, GIT:introduced=0,fixed=504825938c0abfa2fb8ff8d529308830a5ae42ed|ECOSYSTEM:introduced=0,fixed=1.2.21,introduced=2,fixed=2.2.10,introduced=2.3,fixed=2.3.2,introduced=3,fixed=3.0.17,introduced=3.1,fixed=3.1.4; notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.11, ECOSYSTEM:introduced=0,fixed=5.7.11,introduced=6.0.0,fixed=6.4.1.

Is there a fix for CVE-2021-32797?

Yes. jupyterlab (PyPI): upgrade to 1.2.21, 3.1.4 or later; notebook (PyPI): upgrade to 5.7.11, 6.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2021-32797?

Check whether you run jupyterlab (PyPI) or notebook (PyPI) 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

• jupyterlab (PyPI): upgrade to 1.2.21, 3.1.4 or later

  pip install "jupyterlab>=3.1.4"

• notebook (PyPI): upgrade to 5.7.11, 6.4.1 or later

  pip install "notebook>=6.4.1"

Affected products

• jupyterlab (PyPI) ECOSYSTEM:introduced=0,fixed=1.2.21, GIT:introduced=0,fixed=504825938c0abfa2fb8ff8d529308830a5ae42ed|ECOSYSTEM:introduced=0,fixed=1.2.21,introduced=2,fixed=2.2.10,introduced=2.3,fixed=2.3.2,introduced=3,fixed=3.0.17,introduced=3.1,fixed=3.1.4
• notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.11, ECOSYSTEM:introduced=0,fixed=5.7.11,introduced=6.0.0,fixed=6.4.1

Identifiers

• CVE-2021-32797
• GHSA-4952-p58q-6crx
• PYSEC-2021-130
• PYSEC-2026-688