CVE-2016-20026

ZKTeco ZKBioSecurity 3.0 contains hardcoded credentials in the bundled Apache Tomcat server that allow unauthenticated attackers to access the manager application. Attackers can authenticate with hardcoded credentials stored in tomcat-users.xml to upload malicious WAR archives containing JSP applications and execute arbitrary code with SYSTEM privileges.

Score

CVSS 3.1 9.8 Critical

Status

Deferred - disclosure@vulncheck.com

Published

2026-03-16

Last modified

2026-07-28

Weaknesses

CWE-798

Affected products

• Zkbiosecurity Server (Zkteco)

References

• https://cxsecurity.com/issue/WLB-2016080266
• https://exchange.xforce.ibmcloud.com/vulnerabilities/116484
• https://packetstormsecurity.com/files/138567
• https://www.exploit-db.com/exploits/40324/
• https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-hardcoded-credentials-remote-code-execution
• https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5362.php