CVE-2023-28643: Nextcloud Server

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9. Users unable to upgrade should avoid sharing 2 folders with the same name to the same user.

Affected products

• Nextcloud Nextcloud Server: from 24.0.0, before 24.0.9 (fixed in 24.0.9); from 25.0.0, before 25.0.3 (fixed in 25.0.3)

Published 2023-03-30. Last modified 2026-06-17.