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    CVE-2025-66554

    Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. Prior to 5.5.4, 6.0.6, and 7.2.5, a malicious user was able to modify their organisation and title field to load additional CSS files. Javascript and other options were correctly blocked by the content security policy of the Nextcloud Server code. This vulnerability is fixed in 5.5.4, 6.0.6, and 7.2.5.

    Published:Dec 5, 2025
    Last Modified:Dec 9, 2025
    EPS:Dec 5, 2025
    EPSS Score:0.0003
    CVSS Score:3.5

    Affected Products

    Vendor
    Nextcloud
    Product
    Contacts

    Exploits

    No exploit reference

    Related CVEs

    CVE-2023-33182 (CVSS 0) — Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. …
    CVE-2021-39221 (CVSS 6.4) — Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to ve…
    CVE-2020-8280 (CVSS 5.4) — A missing file type check in Nextcloud Contacts 3.4.0 allows a malicious user to upload SVG files as PNG files…
    CVE-2020-8281 (CVSS 5.4) — A missing file type check in Nextcloud Contacts 3.3.0 allows a malicious user to upload malicious SVG files to…
    CVE-2020-8181 (CVSS 4.3) — A missing file type check in Nextcloud Contacts 3.2.0 allowed a malicious user to upload any file as avatars.…
    CVE-2018-3764 (CVSS 4.8) — In Nextcloud Contacts before 2.1.2, a missing sanitization of search results for an autocomplete field could l…

    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