Is CVE-2026-33709 actively exploited?

No active exploitation of CVE-2026-33709 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33709 be exploited remotely?

Yes. CVE-2026-33709 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33709?

CVE-2026-33709 has a CVSS score of 5.1 (MEDIUM).

HOME VULNERABILITIESCVE-2026-33709

MEDIUM

CVE-2026-33709

CWE-601Published: April 3, 2026· Updated: Apr 7, 2026

5.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.4th

Official Description

JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this. This issue has been patched in version 5.4.4.

NVD Source

Technical Analysis

CVE-2026-33709 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (A) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionA

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X