CVE-2025-47793: Nextcloud Group Folders

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Nextcloud Server is a self hosted personal cloud system, and the Nextcloud Groupfolders app provides admin-configured folders shared by everyone in a group or team. In Nextcloud Server prior to 30.0.2, 29.0.9, and 28.0.1, Nextcloud Enterprise Server prior to 30.0.2 and 29.0.9, and Nextcloud Groupfolders app prior to 18.0.3, 17.0.5, and 16.0.11, the absence of quota checking on attachments allowed logged-in users to upload files exceeding the group folder quota. Nextcloud Server versions 30.0.2 and 29.0.9, Nextcloud Enterprise Server versions 30.0.2, 29.0.9, or 28.0.12, and Nextcloud Groupfolders app 18.0.3, 17.0.5, and 16.0.11 fix the issue. No known workarounds are available.

Affected products

• Nextcloud Group Folders: from 16.0.0, before 16.0.11 (fixed in 16.0.11); from 17.0.0, before 17.0.5 (fixed in 17.0.5); from 18.0.0, before 18.0.3 (fixed in 18.0.3)
• Nextcloud Nextcloud Server: from 28.0.0, before 28.0.12 (fixed in 28.0.12); from 29.0.0, before 29.0.9 (fixed in 29.0.9); from 30.0.0, before 30.0.2 (fixed in 30.0.2)

Published 2025-05-16. Last modified 2026-06-17.