Username Enumeration Vulnerability in userSpice by userSpice
CVE-2018-25350

9.3CRITICAL

Key Information:

Vendor

Userspice

Status
Userspice
Vendor
CVE Published:
23 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-25350?

The userSpice 4.3.24 version is affected by a username enumeration vulnerability that allows attackers without authentication to identify valid usernames. By interacting with the existingUsernameCheck.php endpoint using POST requests, attackers can gather information by analyzing the responses for the presence of the 'taken' string. This vulnerability can be exploited to facilitate further attacks or unauthorized access to user accounts, emphasizing the need for robust security measures.

Affected Version(s)

userSpice 4.3.24

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-2018-25350 - Proof of Concept

References

https://www.exploit-db.com/exploits/44872
exploit
https://www.vulncheck.com/advisories/userspice-username-e...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

Dolev Farhi
.