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.

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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
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