CVE-2025-59716: ownCloud Guests

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint. Because of insufficient validation of the supplied token in showPasswordForm, the server responds differently when an e-mail address corresponds to a valid pending guest user rather than a non-existent user.

Affected products

• ownCloud Guests: up to and including 0.12.4

Published 2025-11-05. Last modified 2026-06-17.