Critical severity · published Feb 12, 2026
CVE-2019-25337
OwnCloud 8.1.8 - Username Disclosure
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OW
OwnCloud · OwnCloud
8.1.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-25337
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-25337
ftp.icm.edu.pl
https://ftp.icm.edu.pl/packages/owncloud/
owncloud.org
https://owncloud.org/
www.exploit-db.com
https://www.exploit-db.com/exploits/47745
www.vulncheck.com
https://www.vulncheck.com/advisories/owncloud-username-disclosure
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