What’s Vulnerable › Vulnerabilities

CVE-2016-20030: ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-16 · updated 2026-06-17
• Weakness: CWE-551

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.

Affected products

• ZKTeco Inc. ZKTeco ZKBioSecurity: 3.0.1.0_R_230

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

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