Apache Tomcat Session Fixation Vulnerability - CVE-2019-17563
When using FORM authentication with Apache Tomcat 9.0.0.M1 to 9.0.29 8.5.0 to 8.5.49 and 7.0.0 to 7.0.98 there was a narrow window where an attacker could perform a session fixation attack. The window was considered too narrow for an exploit to be practical but erring on the side of caution this issue has been treated as a security vulnerability.