AIKIDO-2026-116174
tomcat-embed-core is vulnerable to Authentication Bypass
81
High Risk
This Affects:
tomcat-embed-coreTL;DR
tomcat-embed-core DataSourceRealm can fail open for some authenticators such as CLIENT-CERT and SPNEGO. A user is treated as authenticated even when that user does not exist in the configured database. That grants access without a matching realm entry. The fix rejects authentication when the principal cannot be found in the DataSourceRealm.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and DataSourceRealm is used with CLIENT-CERT or SPNEGO authentication.
Background info
tomcat-embed-core is vulnerable to Authentication Bypass in versions 7.0.0 - 9.0.120, 10.1.0 - 10.1.57 and 11.0.0 - 11.0.24.
How to fix this
Upgrade the org.apache.tomcat.embed:tomcat-embed-core library to the patch version.
Links
tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.25lists.apache.org/thread/8robqo76q0osxgw0b5lcwgz0hcf9h4zcopenwall.com/lists/oss-security/2026/08/26/8
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