CVE-2023-39952 Information

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.

Reference

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-cq8w-v4fh-4rjq https://hackerone.com/reports/1808079 https://github.com/nextcloud/server/pull/38890 https://github.com/nextcloud/groupfolders/issues/1906