---
id: CVE-2020-26215
aliases:
  - GHSA-c7vm-f5p4-8fqh
  - BIT-jupyter-base-notebook-2020-26215
  - BIT-jupyter-notebook-2020-26215
  - PYSEC-2020-215
title: Open redirect in Jupyter Notebook
summary: Open redirect in Jupyter Notebook
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:L'
vendor: notebook
product: notebook
ecosystem: pip
affected:
  - notebook < 6.1.5
patched:
  - notebook 6.1.5
published: '2020-11-18'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:48:35.602791913Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-c7vm-f5p4-8fqh'
references:
  - url: >-
      https://github.com/jupyter/notebook/security/advisories/GHSA-c7vm-f5p4-8fqh
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2020-26215'
  - url: >-
      https://github.com/jupyter/notebook/commit/3cec4bbe21756de9f0c4bccf18cf61d840314d74
  - url: 'https://github.com/jupyter/notebook'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/notebook/PYSEC-2020-215.yaml
  - url: 'https://lists.debian.org/debian-lts-announce/2020/12/msg00004.html'
tags:
  - osv
  - pip
epss: 0.01228
epssPercentile: 0.67604
ingestedAt: '2026-09-12T03:13:01.687Z'
---

## Overview

### Impact
_What kind of vulnerability is it? Who is impacted?_

Open redirect vulnerability - a maliciously crafted link to a notebook server could redirect the browser to a different website.

All notebook servers are technically affected, however, these maliciously crafted links can only be reasonably made for known notebook server hosts. A link to your notebook server may *appear* safe, but ultimately redirect to a spoofed server on the public internet.

### Patches

_Has the problem been patched? What versions should users upgrade to?_

Patched in notebook 6.1.5


### References

[OWASP page on open redirects](https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html)

### For more information

If you have any questions or comments about this advisory, or vulnerabilities to report, please email our security list [security@ipython.org](mailto:security@ipython.org).

Credit: zhuonan li of Alibaba Application Security Team

## Affected packages

- `notebook < 6.1.5`

## Remediation

Upgrade to a patched release:

- `notebook 6.1.5`