CVE-2025-47790: Nextcloud Server doesn't request second factor after session timeout

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-16 · updated 2026-06-17
Weakness: CWE-287

Description

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

How to fix

Upgrade to a fixed version: Nextcloud Server 26.0.13.15, 27.1.11.15, 28.0.14.6, 29.0.15. Check the vendor advisory for mitigations.

References

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