Username Enumeration Flaw in OwnCloud by OwnCloud
CVE-2019-25337

5.3MEDIUM

Key Information:

Vendor

Owncloud

Status
Owncloud
Vendor
CVE Published:
12 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25337?

The ownCloud application version 8.1.8 is susceptible to a username enumeration vulnerability, enabling remote attackers to exploit the share.php endpoint. By issuing specifically crafted GET requests to /index.php/core/ajax/share.php with a wildcard search parameter, attackers can retrieve detailed information about user accounts. This flaw poses significant risks as it allows unauthorized individuals to identify valid usernames, potentially facilitating targeted attacks.

Affected Version(s)

OwnCloud 8.1.8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25337 - Proof of Concept

References

https://www.exploit-db.com/exploits/47745
exploit
https://owncloud.org/
product
https://ftp.icm.edu.pl/packages/owncloud/
product

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Daniel Moreno
.