CVE-2023-39952

MEDIUM

Nextcloud Server 22.0.0-27.0.0 - Improper Access Control in Groupfolder Subfolder Permissions

Title source: llm
STIX 2.1

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.

References (4)

Core 4
Core References
Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/nextcloud/groupfolders/issues/1906
Permissions Required x_refsource_misc
https://hackerone.com/reports/1808079

Scores

CVSS v3 6.5
EPSS 0.0029
EPSS Percentile 52.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-284
Status published
Products (3)
nextcloud/nextcloud_server 27.0.0 (2 CPE variants)
nextcloud/nextcloud_server 22.0.0 - 22.2.10.13
nextcloud/nextcloud_server 25.0.0 - 25.0.8
Published Aug 10, 2023
Tracked Since Feb 18, 2026