CVE-2021-41239 Information

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 Vector

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

Reference

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx https://github.com/nextcloud/server/pull/29260 https://github.com/nextcloud/server/issues/27122

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3