CVE-2016-9464

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    CVE-2016-9464

    Published: 28 Mar 2017Last Modified: 7 Aug 2026

    Summary:

    Details: Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

    References: http://www.securityfocus.com/bid/97287, https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202, https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0, https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f, https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8, https://nextcloud.com/security/advisory/?id=nc-sa-2016-007, https://hackerone.com/reports/153905

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -36750094f8b1a2f3bb24ac46348a639fc6197f9c

    Affected versions

    10.0-rc1

    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