CVE-2023-25818: Nextcloud Server

High severity, CVSS 7.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Nextcloud server is an open source, personal cloud implementation. In affected versions a malicious user could try to reset the password of another user and then brute force the 62^21 combinations for the password reset token. As of commit `704eb3aa` password reset attempts are now throttled. Note that 62^21 combinations would significant compute resources to brute force. None the less it is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. There are no known workarounds for this vulnerability.

Affected products

• Nextcloud Nextcloud Server: from 21.0.0, before 21.0.9.10 (fixed in 21.0.9.10); from 22.0.0, 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 2023-03-27. Last modified 2026-06-17.