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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-05

Last Modified

2025-11-06

Generated

2026-07-06

AI Q&A

2025-11-05

EPSS Evaluated

2026-07-05

NVD

CVE-2025-59716

EUVD

EUVD-2025-37881

Affected Vendors & Products

Vendor	Product	Version / Range
owncloud	owncloud	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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.

Attack-Flow Graph

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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