# CVE-2021-32798: Special Element Injection in notebook

Source: https://junglewise.ai/threats/cve-2021-32798-special-element-injection-in-notebook  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-08-09  
License: CC BY 4.0 with a link back

CVE-2021-32798 · Severity: low · CVSS 3.1 · Published 2021-08-09

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.

Technologies: [notebook (PyPI)](https://junglewise.ai/threats/technologies/pypi-notebook). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2021-32798 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-32798 being exploited in the wild.

**How severe is CVE-2021-32798?** Low severity, with a CVSS score of 3.1, published 9 August 2021.

**Which products and versions are affected?** notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.11, GIT:introduced=0,fixed=79fc76e890a8ec42f73a3d009e44ef84c14ef0d5|ECOSYSTEM:introduced=5.7.0,fixed=5.7.11.

**Is there a fix for CVE-2021-32798?** Yes. notebook (PyPI): upgrade to 5.7.11 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-32798?** Check whether you run 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

- notebook (PyPI): upgrade to 5.7.11 or later

  ```sh
  pip install "notebook>=5.7.11"
  ```


## Affected products

- notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.11, GIT:introduced=0,fixed=79fc76e890a8ec42f73a3d009e44ef84c14ef0d5|ECOSYSTEM:introduced=5.7.0,fixed=5.7.11

## Identifiers

- CVE-2021-32798
- GHSA-hwvq-6gjx-j797
- PYSEC-2021-118

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- [PYSEC-2026-2535 - JupyterLab vulnerable to SXSS in Markdown Preview](https://junglewise.ai/threats/cve-2024-22420-jupyterlab-vulnerable-to-sxss-in-markdown-preview)