CVE-2018-25350

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.

Score

CVSS 3.1 9.8 Critical

Status

Deferred - disclosure@vulncheck.com

Published

2026-05-23

Last modified

2026-10-06

Weaknesses

CWE-204

Affected products

• Userspice (Userspice)

References

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