# CVE-2018-25350

## Summary

- **CVE ID:** CVE-2018-25350
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (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)
- **CWE:** CWE-204
- **Published:** May 23, 2026
- **Last Modified:** May 26, 2026

## 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.

## Affected Products

- UserSpice — userSpice (4.3.24)

## References

- [CNA](https://www.exploit-db.com/exploits/44872)
- [CNA](https://www.vulncheck.com/advisories/userspice-username-enumeration-via-existingusernamecheck-php)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._