---
title: "CVE-2024-28179: Jupyter Server Proxy's Websocket Proxying does not require authentication"
url: https://erroneo.us/security/cve/CVE-2024-28179/
description: "CVE-2024-28179 (jupyter-server-proxy (PyPI)): Jupyter Server Proxy allows users to run arbitrary external processes alongside their Jupyter notebook servers…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-03-20
date_modified: 2025-02-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-28179"
kev: false
cvss: 9.1
epss: 0.0103
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-28179: Jupyter Server Proxy's Websocket Proxying does not require authentication

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.0% , percentile 63: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 63% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes jupyter-server-proxy (PyPI) >= 4.0.0, < 4.1.1, fixed in 4.1.1 ; jupyter-server-proxy (PyPI) < 3.2.3, fixed in 3.2.3 . Check your lockfile, including transitive dependencies.

## What it is

Jupyter Server Proxy allows users to run arbitrary external processes alongside their Jupyter notebook servers and provides authenticated web access. Prior to versions 3.2.3 and 4.1.1, Jupyter Server Proxy did not check user authentication appropriately when proxying websockets, allowing unauthenticated access to anyone who had network access to the Jupyter server endpoint. This vulnerability can allow unauthenticated remote access to any websocket endpoint set up to be accessible via Jupyter Server Proxy. In many cases, this leads to remote unauthenticated arbitrary code execution, due to how affected instances use websockets. The websocket endpoints exposed by jupyterserver itself is not affected. Projects that do not rely on websockets are also not affected. Versions 3.2.3 and 4.1.1 contain a fix for this issue.

## Affected packages

- PyPI `jupyter-server-proxy` >= 4.0.0, < 4.1.1 → fixed: 4.1.1
- PyPI `jupyter-server-proxy` < 3.2.3 → fixed: 3.2.3

## Affected products (CVE record)

- jupyterhub jupyter-server-proxy: >= 4.0.0, < 4.1.1, < 3.2.3

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.0 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 1.03% probability of exploitation activity in the next 30 days; percentile 63.

## Sources

- [GitHub Advisory GHSA-w3vc-fx9p-wp4v](https://github.com/advisories/GHSA-w3vc-fx9p-wp4v)
- [CVE.org record CVE-2024-28179](https://www.cve.org/CVERecord?id=CVE-2024-28179)
- [NVD entry CVE-2024-28179](https://nvd.nist.gov/vuln/detail/CVE-2024-28179)
- [github.com](https://github.com/jupyterhub/jupyter-server-proxy/security/advisories/GHSA-w3vc-fx9p-wp4v)
- [github.com](https://github.com/jupyterhub/jupyter-server-proxy/commit/764e499f61a87641916a7a427d4c4b1ac3f321a9)
- [github.com](https://github.com/jupyterhub/jupyter-server-proxy/commit/bead903b7c0354b6efd8b4cde94b89afab653e03)
- [github.com](https://github.com/jupyterhub/jupyter-server-proxy/blob/9b624c4d9507176334b46a85d94a4aa3bcd29bed/jupyter_server_proxy/handlers.py#L433)
- [github.com](https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server-proxy/PYSEC-2024-234.yaml)

---
Source page: https://erroneo.us/security/cve/CVE-2024-28179/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt