# CVE-2020-26232: Open redirect in Jupyter Server

Source: https://junglewise.ai/threats/cve-2020-26232-open-redirect-in-jupyter-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-11-24  
License: CC BY 4.0 with a link back

CVE-2020-26232 · Severity: low · CVSS 3.1 · Published 2020-11-24

Jupyter Server before version 1.0.6 has an Open redirect vulnerability. A maliciously crafted link to a jupyter server could redirect the browser to a different website. All jupyter servers are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may appear safe, but ultimately redirect to a spoofed server on the public internet.

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

## Quick answers

**Is CVE-2020-26232 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-26232 being exploited in the wild.

**How severe is CVE-2020-26232?** Low severity, with a CVSS score of 3.1, published 24 November 2020.

**Which products and versions are affected?** jupyter-server (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.6, GIT:introduced=0,fixed=3d83e49090289c431da253e2bdb8dc479cbcb157|ECOSYSTEM:introduced=0,fixed=1.0.6.

**Is there a fix for CVE-2020-26232?** Yes. jupyter-server (PyPI): upgrade to 1.0.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-26232?** Check whether you run jupyter-server (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

- jupyter-server (PyPI): upgrade to 1.0.6 or later

  ```sh
  pip install "jupyter-server>=1.0.6"
  ```


## Affected products

- jupyter-server (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.6, GIT:introduced=0,fixed=3d83e49090289c431da253e2bdb8dc479cbcb157|ECOSYSTEM:introduced=0,fixed=1.0.6

## Identifiers

- CVE-2020-26232
- GHSA-grfj-wjv9-4f9v
- PYSEC-2020-234

## Related threats

- [Jupyter Server authorization bypass in kernel gateway handlers](https://junglewise.ai/threats/cve-2026-114135-jupyter-server-is-the-backend-for-jupyter-web-applications-from)
- [Jupyter Server token leakage in 5xx error logs](https://junglewise.ai/threats/cve-2026-86049-jupyter-server-token-leakage-in-5xx-error-logs)
- [Jupyter Server stored XSS in nbconvert handlers](https://junglewise.ai/threats/cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers)
- [Jupyter Jupyter Server CORS bypass via improper origin validation](https://junglewise.ai/threats/cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation)
- [Jupyter jupyter-server path traversal in _get_os_path](https://junglewise.ai/threats/cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path)