{"id":"CVE-2016-9464","aliases":["EUVD-2016-10270","GHSA-r69w-pvjm-xg3v"],"status":"published","title":"Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on...","description":"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.","severity":{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01624,"percentile":0.76288,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-285"],"published":"2017-03-28T02:46:00Z","modified":"2026-10-20T10:48:48Z","products":[{"vendor":"nextcloud","product":"nextcloud_server"}],"references":[{"url":"https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"http://www.securityfocus.com/bid/97287","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://nextcloud.com/security/advisory/?id=nc-sa-2016-007","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix"]},{"url":"https://hackerone.com/reports/153905","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-9464"},{"url":"https://github.com/advisories/GHSA-r69w-pvjm-xg3v"}],"sources":{"cve":[{"id":"CVE-2016-9464","description":"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.","status":"published","published":"2017-03-28T02:46:00Z","modified":"2024-08-06T02:50:38.553Z","cwes":["CWE-285"],"updated_at":"2026-11-02T14:33:31.764001Z"}],"euvd":[{"id":"EUVD-2016-10270","description":"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.","status":"published","published":"2017-03-28T02:46:00Z","modified":"2024-08-06T02:50:38Z","updated_at":"2026-11-03T02:22:27.235814Z"}],"ghsa":[{"id":"GHSA-r69w-pvjm-xg3v","title":"Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on...","description":"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.","status":"published","published":"2022-05-13T01:38:32Z","modified":"2023-02-01T05:09:18Z","cvss":[{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T14:50:56.168791Z"}],"nvd":[{"id":"CVE-2016-9464","description":"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.","status":"published","published":"2017-03-28T02:59:00.997Z","modified":"2026-06-17T00:56:07.27Z","cvss":[{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T14:03:37.238712Z"}],"osv":[{"id":"CVE-2016-9464","description":"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.","status":"published","published":"2017-03-28T02:59:00.997Z","modified":"2026-10-20T10:48:48.171770085Z","cvss":[{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:03.472693Z"}]}}