What’s Vulnerable › Vulnerabilities

CVE-2020-26215: Open redirect in Jupyter Notebook

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-18 · updated 2026-06-17
• Weakness: CWE-601

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.

Affected products

• Debian Linux: 9.0
• jupyter notebook: before 6.1.5 — fixed in 6.1.5

How to fix

Upgrade to a fixed version: jupyter notebook 6.1.5. Check the vendor advisory for mitigations.

References

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

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