{"cve":"CVE-2021-41239","nvd":{"published":"2022-03-08T18:15:07.873","modified":"2026-06-17T04:08:09.197","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-862","CWE-200"],"references":["https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx","https://github.com/nextcloud/server/issues/27122","https://github.com/nextcloud/server/pull/29260","https://security.gentoo.org/glsa/202208-17","https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx"],"products":["nextcloud:nextcloud_server"],"source":"nvd","synced_at":"2026-10-19T21:28:04.509275555+00:00"},"epss":{"cve":"CVE-2021-41239","score":0.01248,"percentile":0.69349,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}