Unauthenticated User Enumeration Vulnerability in ownCloud Guests Plugin
CVE-2025-59716

5.3MEDIUM

Key Information:

Vendor

ownCloud

Status
Guests
Vendor
CVE Published:
5 November 2025

What is CVE-2025-59716?

The ownCloud Guests plugin prior to version 0.12.5 allows unauthenticated users to exploit the /apps/guests/register/{email}/{token} endpoint for user enumeration. This arises from inadequate validation of the provided token within the showPasswordForm method. Consequently, the server generates distinct responses based on whether an email address corresponds to an existing pending guest user or not, potentially exposing user data to unauthorized individuals.

References

https://github.com/owncloud/guests
https://yeswehack.com/reports/411806
https://marketplace.owncloud.com/apps/guests

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.