CVE-2023-28847: Nextcloud Server

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. In Nextcloud Server 24.0.0 prior to 24.0.11 and 25.0.0 prior to 25.0.5; as well as Nextcloud Server Enterprise 23.0.0 prior to 23.0.12.6, 24.0.0 prior to 24.0.11, and 25.0.0 prior to 25.0.5; an attacker is not restricted in verifying passwords of share links so they can just start brute forcing the password. Nextcloud Server 24.0.11 and 25.0.5 and Nextcloud Enterprise Server 23.0.12.6, 24.0.11, and 25.0.5 contain a fix for this issue. No known workarounds are available.

Affected products

• Nextcloud Nextcloud Server: from 23.0.0, before 23.0.12.6 (fixed in 23.0.12.6); from 24.0.0, before 24.0.11 (fixed in 24.0.11); from 25.0.0, before 25.0.5 (fixed in 25.0.5)

Published 2023-04-25. Last modified 2026-06-17.