CVE-2023-28998: Nextcloud Desktop

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files.​ Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Affected products

• Nextcloud Desktop: from 3.0.0, before 3.6.5 (fixed in 3.6.5)

Published 2023-04-04. Last modified 2026-06-17.