CVE-2019-25337
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Username Enumeration in OwnCloud 8.1.8 via share.php Endpoint

Publication date: 2026-02-12

Last updated on: 2026-02-13

Assigner: VulnCheck

Description
OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by manipulating the share.php endpoint. Attackers can send crafted GET requests to /index.php/core/ajax/share.php with a wildcard search parameter to retrieve comprehensive user information.
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Meta Information
Published
2026-02-12
Last Modified
2026-02-13
Generated
2026-06-16
AI Q&A
2026-02-13
EPSS Evaluated
2026-06-14
NVD
CVE-2019-25337
EUVD
EUVD-2019-19573
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
owncloud owncloud 8.1.8
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.
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Executive Summary

This vulnerability exists in OwnCloud version 8.1.8 and is a username enumeration flaw. It allows remote attackers to discover valid user accounts by sending specially crafted GET requests to the share.php endpoint. By manipulating the search parameter with a wildcard, attackers can retrieve detailed user information.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of user account information. Attackers can enumerate usernames remotely without authentication, which can be leveraged for further attacks such as phishing, brute force password attempts, or social engineering.

Compliance Impact

I don't know

Detection Guidance

This vulnerability can be detected by sending crafted GET requests to the /index.php/core/ajax/share.php endpoint with a wildcard search parameter to see if user information is returned.

For example, you can use the following curl command to test for username enumeration:

  • curl -v "http://<owncloud-server>/index.php/core/ajax/share.php?search=*"

If the response contains user account information, it indicates the presence of the vulnerability.

Mitigation Strategies

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