CVE-2018-25350 userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php
Unauthenticated attackers can enumerate valid usernames in userSpice by analyzing responses from the existingUsernameCheck.php endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-25350?
CVE-2018-25350 is a critical vulnerability in userSpice, published on 23 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-204
Which versions are affected by CVE-2018-25350?
How do I fix CVE-2018-25350?
No fix has been published for CVE-2018-25350 yet. Limit exposure of the affected software until one is available.
Is CVE-2018-25350 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25350 exists.
Sources
Also known as GHSA-56j3-w2r5-qgxq.