Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

[Web App Scanning] Apache Tomcat Multiple Vulnerabilities

The version of Tomcat installed on the remote host is prior to 9.0.119. It is, therefore, affected by multiple vulnerabilities as referenced in the fixed_in_apache_tomcat_9.0.119_security-9 advisory.

  - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number     guess example for Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from     10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through     7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to     upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-50229)

  - Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the     default servlet ignoring any method or method omission configured as part of the constraint. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached     end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fix the issue. (CVE-2026-55956)

  - Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the     EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through     11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from     7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which     fixes the issue. (CVE-2026-55955)

  - Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and     empty authorisation constraints were not included when the effective web.xml was logged. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be     affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.
    (CVE-2026-55276)

  - Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM     based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through     10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fixes the issue. (CVE-2026-53434)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tomcat installed on the remote host is prior to 11.0.23. It is, therefore, affected by multiple vulnerabilities as referenced in the fixed_in_apache_tomcat_11.0.23_security-11 advisory.

  - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number     guess example for Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from     10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through     7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to     upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-50229)

  - Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the     default servlet ignoring any method or method omission configured as part of the constraint. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached     end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fix the issue. (CVE-2026-55956)

  - Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the     EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through     11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from     7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which     fixes the issue. (CVE-2026-55955)

  - Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and     empty authorisation constraints were not included when the effective web.xml was logged. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be     affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.
    (CVE-2026-55276)

  - Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM     based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through     10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fixes the issue. (CVE-2026-53434)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tomcat installed on the remote host is prior to 10.1.56. It is, therefore, affected by multiple vulnerabilities as referenced in the fixed_in_apache_tomcat_10.1.56_security-10 advisory.

  - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number     guess example for Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from     10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through     7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to     upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-50229)

  - Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the     default servlet ignoring any method or method omission configured as part of the constraint. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached     end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fix the issue. (CVE-2026-55956)

  - Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the     EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through     11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from     7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which     fixes the issue. (CVE-2026-55955)

  - Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and     empty authorisation constraints were not included when the effective web.xml was logged. This issue     affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1     through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be     affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue.
    (CVE-2026-55276)

  - Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM     based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through     10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or     9.0.119, which fixes the issue. (CVE-2026-53434)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
323714	Apache Tomcat 9.0.0.M1 < 9.0.119 multiple vulnerabilities	Nessus	Web Servers	medium
323713	Apache Tomcat 11.0.0.M1 < 11.0.23 multiple vulnerabilities	Nessus	Web Servers	medium
323712	Apache Tomcat 10.1.0.M1 < 10.1.56 multiple vulnerabilities	Nessus	Web Servers	medium

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