{"id":"CVE-2021-32656","details":"Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the \"Add server automatically once a federated share was created successfully\" setting. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable \"Add server automatically once a federated share was created successfully\" in the Nextcloud settings.","aliases":["GHSA-j875-vr2q-h6x6"],"modified":"2026-08-07T19:46:36.298377Z","published":"2021-06-01T22:15:08.173Z","references":[{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j875-vr2q-h6x6"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-17"},{"type":"REPORT","url":"https://hackerone.com/reports/1167853"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nextcloud/server","events":[{"introduced":"0"},{"fixed":"ea6649a511ec5963b984342a50103c3637d621a3"},{"introduced":"615b994816710a595243d704c9be445f736b4b41"},{"fixed":"6e537422555592ba6542780533963a67fff68cf1"},{"introduced":"8985b7930653139859002eb3eca2852999ed8f0d"},{"fixed":"59752ce269dfb122ef9e3ae56c33464551aa74e1"}],"database_specific":{"cpe":"cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"19.0.11"},{"introduced":"20.0.0"},{"fixed":"20.0.10"},{"introduced":"21.0.0"},{"fixed":"21.0.2"}],"source":"CPE_RANGE"}}],"versions":["v19.0.11RC1","v20.0.10RC1","v21.0.2RC1","v19.0.10","v20.0.9","v21.0.1","v19.0.10RC1","v21.0.1RC1","v20.0.9RC1","v19.0.9","v20.0.8","v21.0.0","v19.0.9RC1","v20.0.8RC1","v20.0.7RC1","v20.0.7","v19.0.8","v20.0.6","v19.0.8RC1","v20.0.6RC1","v19.0.7","v20.0.5","v20.0.5RC2","v19.0.7RC1","v20.0.5RC1","v20.0.4","v19.0.6","v20.0.3","v19.0.6RC2","v20.0.3RC2","v19.0.5","v20.0.2","v19.0.5RC2","v20.0.2RC2","v19.0.5RC1","v20.0.2RC1","v20.0.1","v20.0.1RC1","v19.0.4","v19.0.4RC2","v20.0.0","v19.0.40RC1","v19.0.3","v19.0.3RC1","v19.0.2","v19.0.2RC2","v19.0.2RC1","v19.0.1","v19.0.1RC1","v19.0.0","v19.0.0RC3","v19.0.0RC1","v19.0.0beta7","v19.0.0beta6","v19.0.0beta5","v19.0.0beta4","v19.0.0beta3","v19.0.0beta2","v19.0.0beta1","v18.0.0RC1","v18.0.0beta4","v18.0.0beta3","v18.0.0beta2","v18.0.0beta1","v17.0.0beta4","v17.0.0beta3","v17.0.0beta2","v17.0.0beta1","v16.0.0RC1","v16.0.0beta3","v16.0.0beta2","v16.0.0beta1","v16.0.0alpha1","v15.0.0RC1","v15.0.0beta2","v15.0.0beta1","v14.0.0RC2","v14.0.0RC1","v14.0.0beta4","v14.0.0beta3","v14.0.0beta2","v14.0.0beta1","v13.0.0RC1","v13.0.0beta4","v13.0.0beta3","v13.0.0beta2","v13.0.0beta1","v12.0.0beta4","v12.0.0beta3","v12.0.0beta2","v12.0.0beta1","v11.0.0","v11.0RC2","v9.1.0beta1","v9.0.0beta2","v9.0beta1","v8.2RC1","v8.2beta1","v8.1RC2","v8.1.0beta2","v8.1.0beta1","v8.1.0alpha2","v8.1.0alpha1","v8.0.0","v8.0.0RC2","v8.0.0RC1","v8.0.0beta2","v8.0.0beta1","v8.0.0alpha2","v8.0.0alpha1","v7.0.0beta1","v7.0.0alpha2","v6.0.0RC2","v6.0.0RC1","v6.0.0beta5","v6.0.0beta4","v6.0.0beta3","v6.0.0beta2","v6.0.0alpha2","v5.0.0","v5.0.0RC3","v5.0.0RC2","v5.0.0RC1","v5.0.0beta2","v5.0.0beta1","v5.0.0alpha1","v4.5.0","v4.5.0RC3","v4.5.0RC2","v4.5.0RC1","v4.5.0beta4","v4.5.0beta3","v4.0.6","v4.0.5","v4.0.4","v4.0.1","v4.0.0","v4.0.0RC2","v4.0.0RC","v4.0.0beta","v3.0","v1.0.0beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32656.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"}]}