CVE-2025-47790: Nextcloud Server

Medium severity, CVSS 6.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Nextcloud Server is a self hosted personal cloud system. Nextcloud Server prior to 29.0.15, 30.0.9, and 31.0.3 and Nextcloud Enterprise Server prior to 26.0.13.15, 27.1.11.15, 28.0.14.6, 29.0.15, 30.0.9, and 31.0.3 have a bug with session handling. The bug caused skipping the second factor confirmation after a successful login with the username and password when the server was configured with `remember_login_cookie_lifetime` set to `0`, once the session expired on the page to select the second factor and the page is reloaded. Nextcloud Server 29.0.15, 30.0.9, and 31.0.3 and Nextcloud Enterprise Server is upgraded to 26.0.13.15, 27.1.11.15, 28.0.14.6, 29.0.15, 30.0.9 and 31.0.3 contain a patch. As a workaround, set the `remember_login_cookie_lifetime` in config.php to a value other than `0`, e.g. `900`. Beware that this is only a workaround for new sessions created after the configuration change. System administration can delete affected sessions.

Affected products

• Nextcloud Nextcloud Server: from 26.0.0, before 26.0.13.15 (fixed in 26.0.13.15); from 27.0.0, before 27.1.11.15 (fixed in 27.1.11.15); from 28.0.0, before 28.0.14.6 (fixed in 28.0.14.6); from 29.0.0, before 29.0.15 (fixed in 29.0.15); from 30.0.0, before 30.0.9 (fixed in 30.0.9); from 31.0.0, before 31.0.3 (fixed in 31.0.3)

Published 2025-05-16. Last modified 2026-06-17.