CVE-2016-20026 ZKTeco ZKBioSecurity 3.0 Hardcoded Credentials Remote Code Execution
Unauthenticated attackers can use hardcoded Tomcat credentials to upload malicious WAR files and execute arbitrary code with SYSTEM privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-20026?
CVE-2016-20026 is a critical vulnerability in ZKTeco ZKBioSecurity, published on 15 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-798
Which versions are affected by CVE-2016-20026?
How do I fix CVE-2016-20026?
No fix has been published for CVE-2016-20026 yet. Limit exposure of the affected software until one is available.
Is CVE-2016-20026 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-20026 exists.
Sources
Also known as GHSA-69cj-f4mg-xrg8.