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CVE-2021-41239

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Date: March 8, 2022

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.

Language: PHP

Severity Score

Related Resources (6)

https://security.gentoo.org/glsa/202208-17
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx
https://github.com/nextcloud/server/issues/27122
https://nvd.nist.gov/vuln/detail/CVE-2021-41239
https://github.com/nextcloud/server/pull/29260
https://www.mend.io/vulnerability-database/CVE-2021-41239

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Top Fix

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Upgrade Version

Upgrade to version v20.0.14;v21.0.6;v22.2.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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