CVE-2020-26275

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/".

How to fix CVE-2020-26275

To remediate CVE-2020-26275, upgrade the affected package to a fixed version below.

• —upgrade to 1.1.1-1 or later
• —upgrade to 1.1.1 or later
• —no fix listed
• —upgrade to 85e4abccf6ea9321d29153f73b0bd72ccb3a6bca or later

Is CVE-2020-26275 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• from 0, < 1.1.1-1
• from 0, < 1.1.1
• from 0, < 85e4abccf6ea9321d29153f73b0bd72ccb3a6bca | from 0, < 1.1.1

CVSS scores

References (10)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-26275
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-26275
• PATCHgithub.com/jupyter-server/jupyter_server
• PATCHpypi.org/project/jupyter-server/
• WEB