VulnerabilityModified
CVE-2021-41239
This allowed a user to enumerate other users on the instance, even when user listings where disabled.
MEDIUM 5.3EPSS 1.13%
Does this matter?
Lower severity and a low EPSS score (1.13%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 1.13% probability · 65th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-862
- Affected
- nextcloud/nextcloud server
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.