CVE-2018-25350

CRITICAL 9.8

userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing accounts in the system.

CWE	CWE-204
Vendor	userspice
Product	userspice
Published	May 23, 2026
Last Updated	May 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

UserSpice / userSpice

4.3.24

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/44872 vulncheck.com: https://www.vulncheck.com/advisories/userspice-username-enumeration-via-existingusernamecheck-php

Credits

Dolev Farhi