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Jupyterhub CVE-2024-28233

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2024-03-27 security-advisories@github.com
6.1
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required.

Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAI

JupyterHub is an open source multi-user server for Jupyter notebooks. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affected Packages

pypi jupyterhub fix: 4.1.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. JupyterHub is an open source multi-user server for Jupyter notebooks. By tricking a user into visiting a malicious subdomain, the attacker can achieve an XSS directly affecting the former's session. More precisely, in the context of JupyterHub, this XSS could achieve full access to JupyterHub API and user's single-user server. The affected configurations are single-origin JupyterHub deployments and JupyterHub deployments with user-controlled applications running on subdomains or peer subdomains of either the Hub or a single-user server. This vulnerability is fixed in 4.1.0. Affected products include: Jupyter Jupyterhub.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionNVD

JupyterHub is an open source multi-user server for Jupyter notebooks. By tricking a user into visiting a malicious subdomain, the attacker can achieve an XSS directly affecting the former's session. More precisely, in the context of JupyterHub, this XSS could achieve full access to JupyterHub API and user's single-user server. The affected configurations are single-origin JupyterHub deployments and JupyterHub deployments with user-controlled applications running on subdomains or peer subdomains of either the Hub or a single-user server. This vulnerability is fixed in 4.1.0.

Threat Intelligence Overview

EPSS Score
0.3%
Top 75% exploitable
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)NVD

cpe:2.3:a:jupyter:jupyterhub:*:*:*:*:*:*:*:*
CVE-2020-15110 HIGH POC
8.1 Jul 17

In jupyterhub-kubespawner before 0.12, certain usernames will be able to craft particular server names which will grant

CVE-2021-41194 CRITICAL
9.8 Oct 28

FirstUseAuthenticator is a JupyterHub authenticator that helps new users set their password on their first login to Jupy

CVE-2026-54338 MEDIUM POC
5.3 Aug 07

Log flooding via unbounded username input in JupyterHub's form-based login handler allows unauthenticated remote attacke

CVE-2026-33175 HIGH
8.8 Apr 03

Authentication bypass in JupyterHub OAuthenticator <17.4.0 allows authenticated attackers with unverified email addresse

CVE-2021-39160 HIGH
8.8 Aug 25

nbgitpuller is a Jupyter server extension to sync a git repository one-way to a local path. Rated high severity (CVSS 8.

CVE-2020-26261 HIGH
7.9 Dec 09

jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. Rated high severity (C

CVE-2021-41247 HIGH
7.5 Nov 04

JupyterHub is an open source multi-user server for Jupyter notebooks. Rated high severity (CVSS 7.5), this vulnerability

CVE-2024-41942 HIGH
7.2 Aug 08

JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Rated high severity (CVSS 7.

CVE-2019-10255 MEDIUM
6.1 Mar 28

An Open Redirect vulnerability for all browsers in Jupyter Notebook before 5.7.7 and some browsers (Chrome, Firefox) in

CVE-2026-33709 MEDIUM
5.1 Apr 03

Open redirect vulnerability in JupyterHub prior to version 5.4.4 allows unauthenticated remote attackers to craft malici

CVE-2026-108752 LOW
2.3 Oct 11

JupyterHub deployments through 6.0.1 that run in multi-user mode with the named-server feature enabled allow an authenti

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