Insufficient Session Expiration in Jupyter Server - CVE-2026-40934
Published: May 5, 2026
Vulnerability identifier: #VU130162
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40934
CWE-ID: CWE-613
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Jupyter Server
Jupyter Server
Software vendor:
Jupyter
Jupyter
Description
The vulnerability allows a remote user to maintain indefinite authenticated access.
The vulnerability exists due to insufficient session expiration in the authentication cookie handling when reusing previously issued authentication cookies after a password reset and server restart. A remote user can reuse a stolen or compromised authentication cookie to maintain indefinite authenticated access.
The issue affects deployments using password authentication.
Remediation
Install security update from vendor's website.