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    CVE-2025-64011

    Nextcloud Server 30.0.0 is vulnerable to an Insecure Direct Object Reference (IDOR) in the /core/preview endpoint. Any authenticated user can access previews of arbitrary files belonging to other users by manipulating the fileId parameter. This allows unauthorized disclosure of sensitive data, such as text files or images, without prior sharing permissions.

    Published:Dec 12, 2025
    Last Modified:Dec 19, 2025
    EPS:Dec 12, 2025
    EPSS Score:0.00023
    CVSS Score:4.3

    Affected Products

    Vendor
    Nextcloud
    Product
    Nextcloud Server
    Vendor
    Nextcloud
    Product
    Server

    Exploits

    https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharinghttps://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090

    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