title: Nextcloud global site selector authentication bypass
description: Nextcloud Global Site Selector is a tool which allows you to run multiple small Nextcloud instances and redirect users to the right server. A problem in the password verification method allows an attacker to authenticate as another user. It is recommended that the Nextcloud Global Site Selector is upgraded to version 1.4.1, 2.1.2, 2.3.4 or 2.4.5. There are no known workarounds for this issue.
problem types: CWE-306: Missing Authentication for Critical Function
affected:
{
vendor: nextcloud
product: security-advisories
versions:
version: >= 1.1.0, < 1.4.1, status: affected
version: >= 2.0.0, < 2.1.2, status: affected
version: >= 2.2.0, < 2.3.4, status: affected
version: >= 2.4.0, < 2.4.5, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.7
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: CHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
version: 3.1
]