CVE-2016-20030

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.

Score

CVSS 3.1 9.8 Critical

Status

Deferred - disclosure@vulncheck.com

Published

2026-03-16

Last modified

2026-07-28

Weaknesses

CWE-551

Affected products

• Zkbiosecurity Server (Zkteco)

References

• https://exchange.xforce.ibmcloud.com/vulnerabilities/116485
• https://packetstormsecurity.com/files/138573
• https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction
• https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5366.php