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    CVE-2025-61669

    Jupyter Server is the backend for Jupyter web applications. In jupyter_server versions through 2.17.0, the next query parameter in the login flow is insufficiently validated in `LoginFormHandler._redirect_safe()`, which allows redirects to arbitrary external domains via values such as `///example.com`. An attacker can use a crafted login URL to redirect users to a malicious site and facilitate phishing attacks. This issue is fixed in version 2.18.0.

    Published:May 5, 2026
    Last Modified:May 11, 2026
    EPS:May 5, 2026
    EPSS Score:0.00017
    CVSS Score:6.1

    Affected Products

    Vendor
    Jupyter
    Product
    Jupyter Server

    Exploits

    https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653whttps://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

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    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