CVE-2021-41239

Name: CVE-2021-41239
Creator: NVD / NIST
Published: 2022-03-08T18:15:07.873+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2021-41239 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.09%

61.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 20.0.14
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.6
Nextcloud	Nextcloud Server	22.2.0

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrxIssue Tracking, Third Party Advisory
https://github.com/nextcloud/server/issues/27122Issue Tracking, Patch, Third Party Advisory
https://github.com/nextcloud/server/pull/29260Patch, Third Party Advisory
https://security.gentoo.org/glsa/202208-17Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrxIssue Tracking, Third Party Advisory
https://github.com/nextcloud/server/issues/27122Issue Tracking, Patch, Third Party Advisory
https://github.com/nextcloud/server/pull/29260Patch, Third Party Advisory
https://security.gentoo.org/glsa/202208-17Third Party Advisory

Timeline

Published: Mar 8, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41239?

How severe is CVE-2021-41239?

CVE-2021-41239 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41239?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41239?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST