CVE-2019-25337

CRITICAL 9.8

OwnCloud 8.1.8 - Username Disclosure

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-203
Vendor	owncloud
Product	owncloud
Published	Feb 12, 2026
Last Updated	Jul 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

OwnCloud / OwnCloud

8.1.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/47745 owncloud.org: https://owncloud.org/ ftp.icm.edu.pl: https://ftp.icm.edu.pl/packages/owncloud/ vulncheck.com: https://www.vulncheck.com/advisories/owncloud-username-disclosure

Credits

Daniel Moreno