---
id: CVE-2022-29241
aliases:
  - GHSA-q874-g24w-4q9g
  - PYSEC-2022-211
title: Jupyter server Token bruteforcing
summary: Jupyter server Token bruteforcing
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'
vendor: jupyter-server
product: jupyter-server
ecosystem: pip
affected:
  - jupyter-server < 1.17.1
  - 'jupyter-server >= 2.0.0a0, < 2.0.0a1'
patched:
  - jupyter-server 1.17.1
  - jupyter-server 2.0.0a1
published: '2022-06-16'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:49.383978105Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-q874-g24w-4q9g'
references:
  - url: >-
      https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-q874-g24w-4q9g
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2022-29241'
  - url: >-
      https://github.com/jupyter-server/jupyter_server/commit/3485007abbb459585357212dcaa20521989272e8
  - url: >-
      https://github.com/jupyter-server/jupyter_server/commit/877da10cd0d7ae45f8b1e385fa1f5a335e7adf1f
  - url: 'https://github.com/jupyter-server/jupyter_server'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2022-211.yaml
tags:
  - osv
  - pip
epss: 0.00948
epssPercentile: 0.59689
ingestedAt: '2026-09-12T03:13:01.720Z'
---

## Overview

Affects: Notebook and Lab between 6.4.0?(potentially earlier) and 6.4.11 (currently latest). Jupyter Server <=1.16.0. If I am correct about the responsible code it will affect Jupyter-Server 1.17.0 and 2.0.0a0 as well.
Description: If notebook server is started with a value of `root_dir` that contains the starting user's home directory, then the underlying REST API can be used to leak the access token assigned at start time by guessing/brute forcing the PID of the jupyter server. While this requires an authenticated user session, this url can be used from an xss payload (as in CVE-2021-32798) or from a hooked or otherwise compromised browser to leak this access token to a malicious third party. This token can be used along with the REST API to interact with Jupyter services/notebooks such as modifying or overwriting critical files, such as .bashrc or .ssh/authorized_keys, allowing a malicious user to read potentially sensitive data and possibly gain control of the impacted system.


## Affected packages

- `jupyter-server < 1.17.1`
- `jupyter-server >= 2.0.0a0, < 2.0.0a1`

## Remediation

Upgrade to a patched release:

- `jupyter-server 1.17.1`
- `jupyter-server 2.0.0a1`