CVE-2021-41239

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.

Score

CVSS 3.1 5.3 Medium

Status

Modified - security-advisories@github.com

Published

2022-03-08

Last modified

2025-04-23

Weaknesses

CWE-200, CWE-862

Affected products

• Nextcloud Server (Nextcloud)
• Security-advisories (Nextcloud)

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