← Vulnerability feed

Vulnerability record · CVE-2021-32798 · published 9 August 2021

CVE-2021-32798: Jupyter notebook cross-site scripting vulnerability

Jupyter · Notebook

The Jupyter notebook is a web-based notebook environment for interactive computing. In affected versions untrusted notebook can execute code on load. Jupyter Notebook uses a deprecated version of Google Caja to sanitize user inputs. A public Caja bypass can be used to trigger an XSS when a victim opens a malicious ipynb document in Jupyter Notebook. The XSS allows an attacker to execute arbitrary code on the victim computer using Jupyter APIs.

9.6 CVSS 3.1 Critical EPSS 2.1% · top 19.0% CWE-79 · Cross-site scripting
9.6CVSS 3.1 base score, v2 6.8
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Jupyter notebook is a web-based notebook environment for interactive computing. In affected versions untrusted notebook can execute code on load. Jupyter Notebook uses a deprecated version of Google Caja to sanitize user inputs. A public Caja bypass can be used to trigger an XSS when a victim opens a malicious ipynb document in Jupyter Notebook. The XSS allows an attacker to execute arbitrary code on the victim computer using Jupyter APIs.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/jupyter/notebook/commit/79fc76e890a8ec42f73a3d009e44ef84c14ef0d5 ExploitThird Party Advisory
https://github.com/jupyter/notebook/security/advisories/GHSA-hwvq-6gjx-j797 Third Party Advisory
https://github.com/jupyter/notebook/commit/79fc76e890a8ec42f73a3d009e44ef84c14ef0d5 ExploitThird Party Advisory
https://github.com/jupyter/notebook/security/advisories/GHSA-hwvq-6gjx-j797 Third Party Advisory

Track CVE-2021-32798 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.6CVE-2026-42557Jupyterlab cross-site scripting vulnerabilityjupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, Jupyt…EPSS 0.72%7.8CVE-2018-8768Jupyter notebook vulnerabilityIn Jupyter Notebook before 5.4.1, a maliciously forged notebook file can bypass sanitization to execute JavaScript in the notebook context. Specifica…EPSS 1.1%7.5CVE-2022-24758Jupyter notebook sensitive information in log file vulnerabilityThe Jupyter notebook is a web-based notebook environment for interactive computing. Prior to version 6.4.9, unauthorized actors can access sensitive …EPSS 1.1%6.8CVE-2015-7337Ipython notebook improper input validation vulnerabilityThe editor in IPython Notebook before 3.2.2 and Jupyter Notebook 4.0.x before 4.0.5 allows remote attackers to execute arbitrary JavaScript code via …EPSS 2.5%6.5CVE-2024-22421Jupyterlab relative path traversal vulnerabilityJupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook and Architecture. Users of JupyterL…EPSS 0.67%6.1CVE-2024-43805Jupyterlab cross-site scripting vulnerabilityjupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. This vulnerability de…EPSS 0.40%6.1CVE-2024-22420Jupyterlab cross-site scripting vulnerabilityJupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook and Architecture. This vulnerabilit…EPSS 0.57%6.1CVE-2020-26215Jupyter notebook open redirect vulnerabilityJupyter Notebook before version 6.1.5 has an Open redirect vulnerability. A maliciously crafted link to a notebook server could redirect the browser …EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2021-32798), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.