2FA Skipped via Session Bug in Nextcloud Server <29.0.15
CVE-2025-47790 Published on May 16, 2025
Nextcloud Server doesn't request second factor after session timeout
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.
Vulnerability Analysis
CVE-2025-47790 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2025-47790 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2025-47790
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Affected Versions
nextcloud security-advisories:- Version >= 26.0.0, < 26.0.13.15 is affected.
- Version >= 27.0.0, < 27.1.11.15 is affected.
- Version >= 28.0.0, < 28.0.14.6 is affected.
- Version >= 29.0.0, < 29.0.15 is affected.
- Version >= 30.0.0, < 30.0.9 is affected.
- Version >= 31.0.0, < 31.0.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.