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CVE-2020-26275

6.1 · MEDIUM

The Jupyter Server provides the backend (i.e.

Published Dec 21, 2020CWE-601EPSS 1.37%

Overview

CVE-2020-26275 is a medium-severity vulnerability. It was published on December 21, 2020 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila. In Jupyter Server before version 1.1.1, an open redirect vulnerability could cause the jupyter server to redirect the browser to a different malicious website. All jupyter servers running without a base_url prefix 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. This same vulnerability was patched in upstream notebook v5.7.8. This is fixed in jupyter_server 1.1.1. If upgrade is not available, a workaround can be to run your server on a url prefix: "jupyter server --ServerApp.base_url=/jupyter/".

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refadvisory.checkmarx.net/advisory/CX-2020-4291GitHubgithub.com/jupyter-server/jupyter_server/commit/85e4abccf6ea9321d29153f73b0bd72ccb3a6bcaGitHubgithub.com/jupyter-server/jupyter_server/security/advisories/GHSA-9f66-54xg-pc2cRefpypi.org/project/jupyter-server/Refadvisory.checkmarx.net/advisory/CX-2020-4291GitHubgithub.com/jupyter-server/jupyter_server/commit/85e4abccf6ea9321d29153f73b0bd72ccb3a6bcaGitHubgithub.com/jupyter-server/jupyter_server/security/advisories/GHSA-9f66-54xg-pc2cRefpypi.org/project/jupyter-server/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-26275?

CVE-2020-26275 is a medium-severity vulnerability. It was published on December 21, 2020 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2020-26275?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-26275?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-26275?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-26275 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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