CVE-2025-59716
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-05

Last updated on: 2025-11-06

Assigner: MITRE

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.
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Meta Information
Published
2025-11-05
Last Modified
2025-11-06
Generated
2026-06-16
AI Q&A
2025-11-05
EPSS Evaluated
2026-06-15
NVD
CVE-2025-59716
EUVD
EUVD-2025-37881
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
owncloud owncloud *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-203 The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability in ownCloud Guests before version 0.12.5 allows an unauthenticated attacker to enumerate users by exploiting the /apps/guests/register/{email}/{token} endpoint. The issue arises because the server responds differently depending on whether the supplied email corresponds to a valid pending guest user or not, due to insufficient validation of the token in the showPasswordForm function.

Impact Analysis

The vulnerability can allow an attacker to determine which email addresses are registered as pending guest users on the ownCloud instance without authentication. This can lead to privacy breaches and potentially facilitate further targeted attacks such as phishing or social engineering.

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