CVE-2021-41247

JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have multiple JupyterLab tabs open in the same browser session, may see incomplete logout from the single-user server, as fresh credentials (for the single-user server only, not the Hub) reinstated after logout, if another active JupyterLab session is open while the logout takes place. Upgrade to JupyterHub 1.5. For distributed deployments, it is jupyterhub in the _user_ environment that needs patching. There are no patches necessary in the Hub environment. The only workaround is to make sure that only one JupyterLab tab is open when you log out.

• CWE-613
• CWE-613

• https://github.com/jupyterhub/jupyterhub/commit/5ac9e7f73a6e1020ffddc40321fc53336829fe27Patch, Third Party Advisory
• https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-cw7p-q79f-m2v7Third Party Advisory
• https://github.com/jupyterhub/jupyterhub/commit/5ac9e7f73a6e1020ffddc40321fc53336829fe27Patch, Third Party Advisory
• https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-cw7p-q79f-m2v7Third Party Advisory

Published

Nov 4, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-41241Nextcloud server is a self hosted system designed to provide…4.3
• CVE-2021-41242OpenOlat is a web-basedlearning management system. A path tr…8.1
• CVE-2021-41243There is a Potential Zip Slip Vulnerability and OS Command I…8.8
• CVE-2021-41244Grafana is an open-source platform for monitoring and observ…7.2
• CVE-2021-41245Combodo iTop is a web based IT Service Management tool. In v…8.1
• CVE-2021-41246Express OpenID Connect is express JS middleware implementing…8.8
• CVE-2021-41248GraphiQL is the reference implementation of this monorepo, G…4.7
• CVE-2021-41249GraphQL Playground is a GraphQL IDE for development of graph…4.7
• CVE-2021-4125It was found that the original fix for log4j CVE-2021-44228 …8.1
• CVE-2021-41250Python discord bot is the community bot for the Python Disco…4.3
• CVE-2021-41251@sap-cloud-sdk/core contains the core functionality of the S…5.9
• CVE-2021-41252Kirby is an open source file structured CMS ### Impact Kirby…5.4