Critical 9.8Published Feb 12, 2026

CVE-2019-25337OwnCloud 8.1.8 - Username Disclosure

Updated under an hour ago (Oct 26, 2026, 5:40 AM ET)

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It affects OwnCloud. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-203
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OwnCloud OwnCloud owncloud:owncloud (from the name)	8.1.8	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.