CVE-2016-20030
ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-551 |
| Vendor | zkteco inc. |
| Product | zkteco zkbiosecurity |
| Published | Mar 15, 2026 |
| Last Updated | Mar 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
ZKTeco Inc. / ZKTeco ZKBioSecurity
3.0.1.0_R_230
References
zeroscience.mk: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5366.php exchange.xforce.ibmcloud.com: https://exchange.xforce.ibmcloud.com/vulnerabilities/116485 packetstormsecurity.com: https://packetstormsecurity.com/files/138573 vulncheck.com: https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction
Credits
LiquidWorm as Gjoko Krstic of Zero Science Lab