CVE-2018-25350

userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php

Published May 23, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Userspice
Userspice userspice
Vendors & Products Userspice
Userspice userspice
Type Values Removed Values Added
Description 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.
Title userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php
Weaknesses CWE-204
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 26, 2026, 1:27 PM
Reserved
May 23, 2026, 3:34 PM
Status
Deferred
Published
May 23, 2026, 7:16 PM
Modified
Oct 6, 2026, 10:10 PM