CVE-2023-25820: Nextcloud Server

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform, and Nextcloud Enterprise Server is the enterprise version of the file server software. In Nextcloud Server versions 25.0.x prior to 25.0.5 and versions 24.0.x prior to 24.0.10 as well as Nextcloud Enterprise Server versions 25.0.x prior to 25.0.4, 24.0.x prior to 24.0.10, 23.0.x prior to 23.0.12.5, 22.x prior to 22.2.0.10, and 21.x prior to 21.0.9.10, when an attacker gets access to an already logged in user session they can then brute force the password on the confirmation endpoint. Nextcloud Server should upgraded to 24.0.10 or 25.0.4 and Nextcloud Enterprise Server should upgraded to 21.0.9.10, 22.2.10.10, 23.0.12.5, 24.0.10, or 25.0.4 to receive a patch. No known workarounds are available.

Affected products

• Nextcloud Nextcloud Server: from 21.0.0, before 21.0.9 (fixed in 21.0.9); from 22.2.0, before 22.2.10.10 (fixed in 22.2.10.10); from 23.0.0, before 23.0.12.5 (fixed in 23.0.12.5); from 24.0.0, before 24.0.10 (fixed in 24.0.10); from 25.0.0, before 25.0.4 (fixed in 25.0.4)

Published 2023-03-22. Last modified 2026-06-17.