Medium severity · published Nov 5, 2025
CVE-2025-59716
ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint
5.3
CVSS
1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GU
Guests · Owncloud
through 0.12.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59716
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59716
Exploit
https://gist.github.com/thesmartshadow/64ae0449e909174d0479a4f23657147f
Product
https://github.com/owncloud/guests
Product
https://marketplace.owncloud.com/apps/guests
Permissions Required
https://yeswehack.com/reports/411806