Vulnerability CVE-2021-41239
Published: 2022-03-08

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.

Type:

CWE-200

 (Information Exposure)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Nextcloud -> Nextcloud server 

 References:
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
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