CVE-2021-41239

User enumeration setting not respected in Nextcloud server

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.

Categories

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.13%
Vendor Advisory gentoo.org
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx issue tracking third party advisory
https://github.com/nextcloud/server/issues/27122 issue tracking third party advisory patch
https://github.com/nextcloud/server/pull/29260 third party advisory patch
https://security.gentoo.org/glsa/202208-17 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-41239?
CVE-2021-41239 has been scored as a medium severity vulnerability.
How to fix CVE-2021-41239?
To fix CVE-2021-41239, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-41239 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-41239 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-41239?
CVE-2021-41239 affects nextcloud security-advisories.
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