Sign in
Deutsch English Español Polski
High

Jupyter server on Windows discloses Windows user password hash

  • Disclosed: 06.06.2024
  • Updated: 11.10.2026 15:17

Summary

Jupyter Server on Windows has a vulnerability that lets unauthenticated attackers leak the NTLMv2 password hash of the Windows user running the Jupyter server. An attacker can crack this password to gain access to the Windows machine hosting the Jupyter server, or access other network-accessible machines or 3rd party services using that credential. Or an attacker perform an NTLM relay attack without cracking the credential to gain access to other network-accessible machines.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) jupyter-server < 2.14.1 2.14.1

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-200
Platform
Python (PyPI)
Package
jupyter-server
Disclosed
06.06.2024
Updated
11.10.2026 15:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2024-165 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-hrw6-wg82-cm62 - CC BY 4.0

Vulnerability history: jupyter-server

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (14) in the archive
Total entries
14
First → latest
11.2020 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 7
  • Medium 6

Disclosures per year

Severity:
  1. Jupyter Server: 5xx request logging leaks token-bearing Referer header values
    High · 7.1 CVE-2026-86049 < 2.21.0 2.21.0
  2. Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP
    Critical · 5.4 CVE-2026-44727 < 2.20.0 2.20.0
  3. Jupyter Server's Authentication Cookies Remain Valid After Password Reset and Server Restart
    High · 6.8 CVE-2026-40934 < 2.18.0 2.18.0
  4. Jupyter Server has a CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat`
    High CVE-2026-40110 < 2.18.0 2.18.0
  5. Jupyter Server: Path Traversal via incorrect startswith() root directory check allows access to sibling directories
    High · 7.1 CVE-2026-35397 < 2.18.0 2.18.0
  6. Jupyter server on Windows discloses Windows user password hash this entry
    High · 7.5 CVE-2024-35178 < 2.14.1 2.14.1
  7. Jupyter server Token bruteforcing
    High · 7.1 CVE-2022-29241 < 1.17.1, >= 2.0.0a0, < 2.0.0a1 1.17.1, 2.0.0a1
  8. The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications. Prior to version 1.15.4, unauthorized actors can access sensitive information f
    High · 7.5 CVE-2022-24757 < 1.15.4 1.15.4

Know which vulnerabilities affect your application

With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.

Connect your application
DockRay newsletter

Application security in your inbox

Important vulnerabilities, actionable guidance and practical advice for your applications. Choose your technologies and follow what matters to your project.

  • A daily digest of new vulnerabilities, critical ones included.
  • Notifications about important updates.
  • Practical advice on application security and monitoring.

Leave empty to receive updates for every technology.

Privacy policy

Free to subscribe. Unsubscribe with one click in any email.