{"id":"CVE-2021-41239","aliases":["EUVD-2021-28293","GHSA-g722-cm3h-8wrx","openSUSE-SU-2022:0089-1","openSUSE-SU-2022:0098-1"],"status":"published","title":"User enumeration setting not respected in Nextcloud server","description":"Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01248,"percentile":0.69578,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200","CWE-862"],"published":"2022-03-08T18:05:12Z","modified":"2026-10-20T10:54:57Z","affected":[{"source":"osv","ecosystem":"SUSE:Package Hub 12","package":"nextcloud","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0.9-37.1"}]}],"bundled":3},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP3","package":"nextcloud","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0.9-bp153.2.12.1"}]}],"bundled":3},{"source":"osv","ecosystem":"openSUSE:Leap 15.3","package":"nextcloud","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0.9-bp153.2.12.1"}]}],"bundled":3}],"products":[{"vendor":"kiteworks","product":"security-advisories"},{"vendor":"nextcloud","product":"nextcloud_server"},{"vendor":"nextcloud","product":"security-advisories"}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://github.com/nextcloud/server/issues/27122","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/nextcloud/server/pull/29260","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://security.gentoo.org/glsa/202208-17","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/LRMAMGLMCXJ2VKQZRQSKAEGDMPY3MZN7/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1196905","tags":["report"]},{"url":"https://bugzilla.suse.com/1196908","tags":["report"]},{"url":"https://bugzilla.suse.com/1196952","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-41239","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-41241","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-41741","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/EZTHEQMMIKP2RX3EBMXDQAOIVUPMCDFB/","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-41239","title":"User enumeration setting not respected in Nextcloud server","description":"Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.","status":"published","published":"2022-03-08T18:05:12Z","modified":"2025-04-23T18:58:33.406Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2021-28293","description":"Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.","status":"published","published":"2022-03-08T18:05:12Z","modified":"2025-04-23T18:58:33Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:07.453218Z"}],"nvd":[{"id":"CVE-2021-41239","description":"Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.","status":"published","published":"2022-03-08T18:15:07.873Z","modified":"2026-06-17T04:08:09.197Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-862"],"updated_at":"2026-11-02T14:07:05.198719Z"}],"osv":[{"id":"CVE-2021-41239","description":"Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.","status":"published","published":"2022-03-08T18:15:07.873Z","modified":"2026-10-20T10:54:57.885951753Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.557945Z"},{"id":"openSUSE-SU-2022:0089-1","title":"Security update for nextcloud","description":"This update for nextcloud fixes the following issues:\n\nnextcloud was updated to 21.0.9:\n\n- CVE-2021-41239 (CWE-200): user enumeration setting not obeyed in User Status API (boo#1196905)\n- CVE-2021-41241 (CWE-863): groupfolders advanced permissions is not obeyed for subfolders (boo#1196908)\n- CVE-2021-41741 (CWE-400): High memory usage for generating preview of broken image (boo#1196952)\n- For more changes see https://nextcloud.com/changelog/#21-0-9\n","status":"published","published":"2022-03-23T17:01:26Z","modified":"2025-05-07T18:13:15.913555Z","updated_at":"2026-11-02T16:58:32.653274Z"},{"id":"openSUSE-SU-2022:0098-1","title":"Security update for nextcloud","description":"This update for nextcloud fixes the following issues:\n\nnextcloud was updated to 21.0.9:\n\n- CVE-2021-41239 (CWE-200): user enumeration setting not obeyed in User Status API (boo#1196905)\n- CVE-2021-41241 (CWE-863): groupfolders advanced permissions is not obeyed for subfolders (boo#1196908)\n- CVE-2021-41741 (CWE-400): High memory usage for generating preview of broken image (boo#1196952)\n- For more changes see https://nextcloud.com/changelog/#21-0-9\n","status":"published","published":"2022-03-31T10:01:17Z","modified":"2026-02-04T02:46:24.651274Z","updated_at":"2026-11-02T16:58:32.653274Z"}]}}