title: Advanced permissions not respected when copying entire group folders
description: Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.
problem types: CWE-284: Improper Access Control
affected:
{
vendor: nextcloud
product: security-advisories
versions:
version: >= 22.0.0, < 22.2.10.13, status: affected
version: >= 23.0.0, < 23.0.12.8, status: affected
version: >= 24.0.0, < 24.0.12.4, status: affected
version: >= 25.0.0, < 25.0.8, status: affected
version: >= 26.0.0, < 26.0.3, status: affected
version: >= 27.0.0, < 27.0.1, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
version: 3.1
]