Open redirect in jupyterhub - CVE-2026-33709
Published: April 28, 2026
Vulnerability identifier: #VU128394
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33709
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect users to an arbitrary attacker-controlled site.
The vulnerability exists due to url redirection to an untrusted site in the JupyterHub login redirect handling when processing crafted links. A remote attacker can construct a crafted link to redirect users to an arbitrary attacker-controlled site.
User interaction is required to click the crafted link.
Affected software
jupyterhub
How to mitigate CVE-2026-33709
Install security update from vendor's website.
jupyterhub - update to 5.4.4