CVE-2019-25337

5.3 mediumEPSS 0.5%

Medium (5.3). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

5.3 medium

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

CVSS 3.1

9.8 critical

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
CWE: CWE-203
Published: 2026-02-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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