id: PYSEC-2026-2531
published: "2026-07-09T16:49:45.846184Z"
modified: "2026-07-13T16:04:22.389775Z"
aliases:
- CVE-2019-9644
- GHSA-hhx8-cr55-qcxx
summary: Improper Neutralization of Input During Web Page Generation in Jupyter Notebook
details: An XSSI (cross-site inclusion) vulnerability in Jupyter Notebook before 5.7.6 allows inclusion of resources on malicious pages when visited by users who are authenticated with a Jupyter server. Access to the content of resources has been demonstrated with Internet Explorer through capturing of error messages, though not reproduced with other browsers. This occurs because Internet Explorer's error messages can include the content of any invalid JavaScript that was encountered.
affected:
- package:
    name: jupyter-notebook
    ecosystem: PyPI
    purl: pkg:pypi/jupyter-notebook
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 5.7.6
  versions:
  - 4.0.0.dev
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2019-9644
- type: PACKAGE
  url: https://github.com/jupyter/notebook
- type: WEB
  url: https://github.com/jupyter/notebook/compare/f3f00df...05aa4b2
- type: WEB
  url: https://github.com/pypa/advisory-database/tree/main/vulns/notebook/PYSEC-2019-159.yaml
- type: WEB
  url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UP5RLEES2JBBNSNLBR65XM6PCD4EMF7D
- type: WEB
  url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VMDPJBVXOVO6LYGAT46VZNHH6JKSCURO
- type: PACKAGE
  url: https://pypi.org/project/jupyter-notebook
- type: ADVISORY
  url: https://github.com/advisories/GHSA-hhx8-cr55-qcxx
severity:
- type: CVSS_V3
  score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N