It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1945 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)

    Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if     the first condition in an OR chain matched, subsequent non-OR conditions were skipped.

    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 fix the issue.
    (CVE-2026-53404)

    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)

    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)

    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)

    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 Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed     security constraint bypass for some configurations.

    This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from     9.0.0.M1 through 9.0.119, 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 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
    (CVE-2026-59083)

    Insufficient Technical Documentation vulnerability in Apache Tomcat since the requirements to securely     configure the EncryptInterceptor were not clearly documented.

    This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from     9.0.13 through 9.0.119, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Other versions that     have reached end of support may also be affected.

    Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120 which fix the issue.
    (CVE-2026-59084)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

Detections

Analytics

Amazon Linux 2023 : tomcat9, tomcat9-admin-webapps, tomcat9-el-3.0-api (ALAS2023-2026-1945)

critical Nessus Plugin ID 328483

Version 1.2

Version 1.1

Version 1.2 Jul 31, 2026, 1:14 PM CVE (set "CVE" coverage to "CVE-2026-50229,CVE-2026-53404,CVE-2026-53434,CVE-2026-55276,CVE-2026-55955,CVE-2026-55956,CVE-2026-59083,CVE-2026-59084") CVSSv2 score source (changed from "CVE-2026-55276" to "CVE-2026-59084") Plugin metadata Plugin Feed: 202607311314
Version 1.1 Jul 21, 2026, 8:31 PM New Plugin Feed: 202607212031