PYSEC-2026-2531

    Dashboard / Vulnerabilities / PYSEC-2026-2531

    PYSEC-2026-2531

    Published: 9 Jul 2026Last Modified: 13 Jul 2026

    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.

    References: https://nvd.nist.gov/vuln/detail/CVE-2019-9644, https://github.com/jupyter/notebook, https://github.com/jupyter/notebook/compare/f3f00df...05aa4b2, https://github.com/pypa/advisory-database/tree/main/vulns/notebook/PYSEC-2019-159.yaml, https://lists.fedoraproject.org/archives/list/[email protected]/message/UP5RLEES2JBBNSNLBR65XM6PCD4EMF7D, https://lists.fedoraproject.org/archives/list/[email protected]/message/VMDPJBVXOVO6LYGAT46VZNHH6JKSCURO, https://pypi.org/project/jupyter-notebook, https://github.com/advisories/GHSA-hhx8-cr55-qcxx

    Affected packages

    Package

    Name: jupyter-notebook

    Purl: pkg:pypi/jupyter-notebook

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.7.6

    Affected versions

    4.0.0.dev

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High