CVE-2016-20030: ZKTeco Inc ZKTeco Zkbiosecurity

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• ZKTeco Inc ZKTeco Zkbiosecurity: version 3.0.1.0_R_230 only

Published 2026-03-16. Last modified 2026-06-17.