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CVE-2026-33709— JupyterHub has an Open Redirect Vulnerability

Quick assessment

Affected
jupyterhub jupyterhub
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JupyterHub是JupyterHub开源的一款用于Jupyter的多用户服务器。 JupyterHub 5.4.4之前版本存在输入验证错误漏洞，该漏洞源于开放重定向，可能导致用户被重定向至攻击者控制的站点。

AI Predicted 6.1 Difficulty: Trivial EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-33709

Vulnerability Information
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Vulnerability Title
JupyterHub has an Open Redirect Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
JupyterHub 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterHub是JupyterHub开源的一款用于Jupyter的多用户服务器。 JupyterHub 5.4.4之前版本存在输入验证错误漏洞，该漏洞源于开放重定向，可能导致用户被重定向至攻击者控制的站点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterhub jupyterhub < 5.4.4 -

II. Public POCs for CVE-2026-33709

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III. Intelligence Information for CVE-2026-33709

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Vendor Advisories for CVE-2026-33709 (1)

Same Patch Batch · jupyterhub · 2026-04-03 · 3 CVEs total

CVE-2026-33175 8.8 HIGH OAuthenticator: Authentication Bypass in Auth0OAuthenticator via Unverified Email Claims
CVE-2026-34052 5.9 MEDIUM LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service

IV. Related Vulnerabilities

Same product: jupyterhub
Same vendor: jupyterhub
Same weakness: CWE-601

V. Comments for CVE-2026-33709

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