---
id: CVE-2023-39968
aliases:
  - GHSA-r726-vmfq-j9j3
  - PYSEC-2023-155
title: ' Open Redirect Vulnerability in jupyter-server'
summary: ' Open Redirect Vulnerability in jupyter-server'
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
vendor: jupyter-server
product: jupyter-server
ecosystem: pip
affected:
  - jupyter-server < 2.7.2
patched:
  - jupyter-server 2.7.2
published: '2023-08-29'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:02.877012647Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-r726-vmfq-j9j3'
references:
  - url: >-
      https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-r726-vmfq-j9j3
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-39968'
  - url: >-
      https://github.com/jupyter-server/jupyter_server/commit/290362593b2ffb23c59f8114d76f77875de4b925
  - url: 'https://blog.xss.am/2023/08/cve-2023-39968-jupyter-token-leak'
  - url: 'https://github.com/jupyter-server/jupyter_server'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2023-155.yaml
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NRP7DNZYVOIA4ZB3U3ZWKTFZEPYWNGCQ
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XDKQAWQN6SQTOVACZNXYKEHWQXGG4DOF
tags:
  - osv
  - pip
epss: 0.00681
epssPercentile: 0.50366
ingestedAt: '2026-09-12T03:13:01.724Z'
---

## Overview

### Impact

Open Redirect Vulnerability. Maliciously crafted login links to known Jupyter Servers  can cause successful login or an already logged-in session to be redirected to arbitrary sites, which should be restricted to Jupyter Server-served URLs.


### Patches

Upgrade to Jupyter Server 2.7.2

### Workarounds

None.

### References

Vulnerability reported by user davwwwx via the [bug bounty program](https://app.intigriti.com/programs/jupyter/jupyter/detail) [sponsored by the European Commission](https://commission.europa.eu/news/european-commissions-open-source-programme-office-starts-bug-bounties-2022-01-19_en) and hosted on the [Intigriti platform](https://www.intigriti.com/).

- https://blog.xss.am/2023/08/cve-2023-39968-jupyter-token-leak/


## Affected packages

- `jupyter-server < 2.7.2`

## Remediation

Upgrade to a patched release:

- `jupyter-server 2.7.2`