{"id":"BIT-nextcloud-2021-41166","summary":"Permission bypass in Nextcloud Android App","details":"The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. An issue in versions prior to 3.17.1 may lead to sensitive information disclosure. An unauthorized app that does not have the otherwise required `MANAGE_DOCUMENTS` permission may view image thumbnails for images it does not have permission to view. Version 3.17.1 contains a patch. There are no known workarounds.","aliases":["CVE-2021-41166","GHSA-wrwg-jwpg-r3c4"],"modified":"2026-09-08T08:48:16.227254703Z","published":"2026-07-12T23:47:44.767Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:android:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/nextcloud/android/commit/aa47197109970b8449c4e44601eba36e3481b086"},{"type":"ADVISORY","url":"https://github.com/nextcloud/android/commit/b6ecf515b38c2d82d32743f27236534f3e03ee0c"},{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wrwg-jwpg-r3c4"},{"type":"WEB","url":"https://hackerone.com/reports/1358597"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41166"}],"affected":[{"package":{"name":"nextcloud","ecosystem":"Bitnami","purl":"pkg:bitnami/nextcloud"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.17.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nextcloud/BIT-nextcloud-2021-41166.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}],"schema_version":"1.9.0"}