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BREW-jupyterlab-CVE-2020-26215 — Open redirect in Jupyter Notebook

2026-10-08T19:24:00.719303+00:00

Affected: Homebrew: jupyterlab

### 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

CVE-2020-26215 — Open redirect in Jupyter Notebook

2026-10-08T19:24:00.719379+00:00

Affected: jupyter notebook

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.

GHSA-c7vm-f5p4-8fqh — Open redirect in Jupyter Notebook

2026-10-08T19:24:00.719413+00:00

Affected: PyPI: notebook