CVE-2020-26275

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/”.