CVE-2021-41239 - CVE House

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Status published Medium CVE-2021-41239

User enumeration setting not respected in Nextcloud server

5.3 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from nextcloud

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Affected Vendor

nextcloud

View all reports →

Affected Software

security-advisories

Vulnerable Versions:

< 20.0.14, >= 21.0.0, < 21.0.6, >= 22.2.0, < 22.2.1

Timeline

Official Publish: March 8th, 2022

Last Modified: April 23rd, 2025

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1213 Data from Information Repositories

T1005 Data from Local System

T1552 Unsecured Credentials

Credential Access

T1041 Exfiltration Over C2 Channel