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Vulnerability record · CVE-2018-25350 · published 23 May 2026

CVE-2018-25350: userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discov…

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.

9.3 CVSS 4.0 Critical EPSS 0.43% · top 64.9% CWE-204 · CWE-204 Deferred
9.3CVSS 4.0 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2018-25350), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.