What’s Vulnerable › Vulnerabilities

CVE-2020-26232: Open redirect in Jupyter Server

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-24 · updated 2026-06-17
• Weakness: CWE-601

Description

Jupyter Server before version 1.0.6 has an Open redirect vulnerability. A maliciously crafted link to a jupyter server could redirect the browser to a different website. All jupyter servers are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may appear safe, but ultimately redirect to a spoofed server on the public internet.

Affected products

• jupyter-server jupyter_server: before 1.0.6 — fixed in 1.0.6

How to fix

Upgrade to a fixed version: jupyter-server jupyter_server 1.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/jupyter-server/jupyter_server/blob/master/CHANGELOG.md#106---2020-11-18
• https://github.com/jupyter-server/jupyter_server/commit/3d83e49090289c431da253e2bdb8dc479cbcb157
• https://github.com/jupyter/jupyter_server/security/advisories/GHSA-grfj-wjv9-4f9v
• https://github.com/jupyter-server/jupyter_server/blob/master/CHANGELOG.md#106---2020-11-18
• https://github.com/jupyter-server/jupyter_server/commit/3d83e49090289c431da253e2bdb8dc479cbcb157
• https://github.com/jupyter/jupyter_server/security/advisories/GHSA-grfj-wjv9-4f9v

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