Vulnerability · Published Mar 8, 2022 · Assigned by GitHub_M

CVE-2021-41239User enumeration setting not respected in Nextcloud server

Medium 5.3

In plain English

A medium-severity information exposure in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)1.2%top 30.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 20.0.14>= 21.0.0, < 21.0.6>= 22.2.0, < 22.2.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g722-cm3h-8wrx x_refsource_CONFIRM
https://github.com/nextcloud/server/issues/27122 x_refsource_MISC
https://github.com/nextcloud/server/pull/29260 x_refsource_MISC
GLSA-202208-17 vendor-advisory, x_refsource_GENTOO