CVE-2022-31014: Nextcloud Server

Low severity, CVSS 3.5. EPSS: 2.5% chance of exploitation in the next 30 days.

Nextcloud server is an open source personal cloud server. Affected versions were found to be vulnerable to SMTP command injection. The impact varies based on which commands are supported by the backend SMTP server. However, the main risk here is that the attacker can then hijack an already-authenticated SMTP session and run arbitrary SMTP commands as the email user, such as sending emails to other users, changing the FROM user, and so on. As before, this depends on the configuration of the server itself, but newlines should be sanitized to mitigate such arbitrary SMTP command injection. It is recommended that the Nextcloud Server is upgraded to 22.2.8 , 23.0.5 or 24.0.1. There are no known workarounds for this issue.

Affected products

• Nextcloud Nextcloud Server: before 19.0.13.7 (fixed in 19.0.13.7); before 22.2.8 (fixed in 22.2.8); from 20.0.0, before 20.0.14.6 (fixed in 20.0.14.6); from 21.0.0, before 21.0.9.5 (fixed in 21.0.9.5); from 23.0.0, before 23.0.5 (fixed in 23.0.5); version 24.0.0 only

Published 2022-07-05. Last modified 2026-06-17.