CVE-2021-41239 MEDIUM

CVE-2021-41239: User enumeration setting not respected in Nextcloud server

Vendor Nextcloud
Product security-advisories
Weakness CWE-200 · Info exposure
Published March 8, 2022
Last update April 23, 2025
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 8, 2022 CVE published
April 23, 2025 Record updated