title: Improper handling of request URLs in Nextcloud Guests app allows guest users to bypass app allowlist
description: Nextcloud guests app is a utility to create guest users which can only see files shared with them. In affected versions users were able to load the first page of apps they were actually not allowed to access. Depending on the selection of apps installed this may present a permissions bypass. It is recommended that the Guests app is upgraded to 2.4.1, 2.5.1 or 3.0.1. There are no known workarounds for this vulnerability.
problem types: CWE-281: Improper Preservation of Permissions
affected:
{
vendor: nextcloud
product: security-advisories
versions:
version: >= 2.4.0, < 2.4.1, status: affected
version: >= 2.5.0, < 2.5.1, status: affected
version: >= 3.0.0, < 3.0.1, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
version: 3.1
]