CVE-2023-39959

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    CVE-2023-39959

    Published: 10 Aug 2023Last Modified: 12 Aug 2026

    Summary: Existence of calendars and address books can be checked by unauthenticated users

    Details: Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.9, 26.0.4, and 27.0.1, unauthenticated users could send a DAV request which reveals whether a calendar or an address book with the given identifier exists for the victim. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

    References: https://hackerone.com/reports/1832126, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39959.json, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj, https://nvd.nist.gov/vuln/detail/CVE-2023-39959, https://github.com/nextcloud/server/pull/38747

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 20ea9a25353129b56d46951fe7d23939665ab2b2
    Fixed -fbc4a4aad97572da902fef0ee61cbd49bba58365

    Affected versions

    27.0.0

    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-2023-39959 | CVE-DB