CVE-2019-25337 | OwnCloud 8.1.8 contains a username enumeration vulnerability… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2019-25337
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-02-12 14:45 UTC
Published: 2026-02-12 22:48 UTC
Last updated: 2026-07-15 01:23 UTC
Primary CWE: CWE-203
Observable Discrepancy
Vendor / Product: OwnCloud / OwnCloud
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
OwnCloud	OwnCloud	—	8.1.8

Weakness (CWE)

CWE	Source	Description
CWE-203	cna	Observable Discrepancy

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.3	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References (4)

ExploitDB-47745 https://www.exploit-db.com/exploits/47745
OwnCloud Official Homepage https://owncloud.org/
OwnCloud Software Download Repository https://ftp.icm.edu.pl/packages/owncloud/
VulnCheck Advisory: OwnCloud 8.1.8 - Username Disclosure https://www.vulncheck.com/advisories/owncloud-username-disclosure