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    CVE-2026-108752

    JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own server.

    Published:Oct 11, 2026
    Last Modified:Oct 13, 2026
    EPS:Oct 11, 2026
    EPSS Score:0.00245
    CVSS Score:4.2

    Affected Products

    Vendor
    Jupyter
    Product
    Jupyterhub
    Vendor
    Jupyterhub
    Product
    Jupyterhub

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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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
    CVE-2026-108752 — Jupyter, Jupyterhub (Low 2.3) | CVE-DB