Multiple critical vulnerabilities have been identified in Apache Tomcat versions from 7.0.0 through 11.0.26, including authentication bypass, request/response mix-up, failing open in FIPS mode, execution after redirect, local unauthorized access via TOCTOU race condition, and incomplete cleanup issues affecting HTTP/2, TLS 1.3, and trailer information leakage. These issues allow attackers to bypass authentication, cause data leakage between users, fail secure configurations, and potentially gain unauthorized local access. Users are strongly recommended to upgrade to Apache Tomcat versions 11.0.27, 10.1.61, or 9.0.123, which contain fixes for all these vulnerabilities.