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    CVE-2025-66547

    Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.

    Published:Dec 5, 2025
    Last Modified:Dec 9, 2025
    EPS:Dec 5, 2025
    EPSS Score:0.00028
    CVSS Score:4.3

    Affected Products

    Vendor
    Nextcloud
    Product
    Nextcloud
    Vendor
    Nextcloud
    Product
    Nextcloud Enterprise Server
    Vendor
    Nextcloud
    Product
    Nextcloud Server
    Vendor
    Nextcloud
    Product
    Server

    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