CVE-2020-15110: Jupyterhub Kubespawner

High severity, CVSS 8.1. EPSS: 1.1% chance of exploitation in the next 30 days.

In jupyterhub-kubespawner before 0.12, certain usernames will be able to craft particular server names which will grant them access to the default server of other users who have matching usernames. This has been fixed in 0.12.

Affected products

• Jupyterhub Kubespawner: before 0.12 (fixed in 0.12)

Published 2020-07-17. Last modified 2026-06-17.