CVE-2023-25160: Nextcloud Mail

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Nextcloud Mail is an email app for the Nextcloud home server platform. Prior to versions 2.2.1, 1.14.5, 1.12.9, and 1.11.8, an attacker can access the mail box by ID getting the subjects and the first characters of the emails. Users should upgrade to Mail 2.2.1 for Nextcloud 25, Mail 1.14.5 for Nextcloud 22-24, Mail 1.12.9 for Nextcloud 21, or Mail 1.11.8 for Nextcloud 20 to receive a patch. No known workarounds are available.

Affected products

• Nextcloud Mail: before 1.11.8 (fixed in 1.11.8); from 1.12.0, before 1.12.9 (fixed in 1.12.9); from 1.13.0, before 1.14.5 (fixed in 1.14.5); from 2.0.0, before 2.2.1 (fixed in 2.2.1)

Published 2023-02-13. Last modified 2026-06-17.