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    CVE-2016-9464

    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.

    Published:Mar 28, 2017
    Last Modified:Apr 20, 2025
    EPS:Mar 28, 2017
    EPSS Score:0.00292
    CVSS Score:4.3

    Affected Products

    Vendor
    Nextcloud
    Product
    Nextcloud Server

    Exploits

    https://hackerone.com/reports/153905https://hackerone.com/reports/153905

    Common Weakness Enumeration

    CWE-285 Improper Authorization

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    CVE-2026-45285 (CVSS 6.4) — Nextcloud is an open source content collaboration platform. From versions 32.0.0 to before 32.0.9, and 33.0.0 …
    CVE-2026-45283 (CVSS 6.3) — Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before…
    CVE-2026-45282 (CVSS 6.5) — Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before…
    CVE-2026-45281 (CVSS 8.1) — Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before…
    CVE-2026-45279 (CVSS 4.4) — Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before…
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    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://hackerone.com/reports/153905
    https://nextcloud.com/security/advisory/?id=nc-sa-2016-007
    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://hackerone.com/reports/153905
    https://nextcloud.com/security/advisory/?id=nc-sa-2016-007

    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