CVE-2016-20030 ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction
Unauthenticated attackers can enumerate valid usernames in ZKTeco ZKBioSecurity by analyzing responses to login requests, facilitating targeted attacks.
- 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-2016-20030?
CVE-2016-20030 is a critical vulnerability in ZKTeco ZKBioSecurity, published on 15 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses.
Weakness: CWE-551
Which versions are affected by CVE-2016-20030?
How do I fix CVE-2016-20030?
No fix has been published for CVE-2016-20030 yet. Limit exposure of the affected software until one is available.
Is CVE-2016-20030 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-20030 exists.
Sources
Also known as GHSA-5mcw-4937-qq36.