CVE-2018-25350

critical · 9.3

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

0.4%

EPSS (exploit prob.)

37th

EPSS percentile

2026-05-23

Published

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:X/V:X/RE:X/U:X

Weaknesses

CWE-204

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2018-25350