Information disclosure in ownCloud Guests
CVE-2025-59716
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000
Affected products
Weakness classification (CWE)
References
- github.com/owncloud/guests (Product)
- yeswehack.com/reports/411806 (Permissions Required)
- marketplace.owncloud.com/apps/guests (Product)
- gist.github.com/thesmartshadow/64ae0449e909174d0479a4f23657147f (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-59716?
- CVE-2025-59716 is a medium-severity vulnerability in ownCloud Guests, classified under Information Disclosure. CVSS score: 5.3/10. Published 2025-11-05.
- How severe is CVE-2025-59716?
- Medium severity. CVSS v3 base score is 5.3 out of 10.