Improper access control in Apache Tomcat - CVE-2026-55956

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Main Vulnerability Database Vulnerabilities #VU135862

Improper access control in Apache Tomcat - CVE-2026-55956

Published: June 30, 2026 / Updated: July 1, 2026


Vulnerability identifier: #VU135862
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55956
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass security constraints.

The vulnerability exists due to improper access control in the default servlet when processing requests subject to configured security constraints with method or method omission settings. A remote attacker can send a crafted request using an ignored method to bypass security constraints.


Affected software

Apache Tomcat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Web and Scripting Module
openSUSE Leap
openEuler
Anolis OS
tomcat-help
tomcat
tomcat-jsvc
tomcat-lib
tomcat-docs-webapp
tomcat-webapps
tomcat-el-3_0-api
tomcat-jsp-2_3-api
tomcat-servlet-4_0-api
tomcat-javadoc
tomcat-admin-webapps
tomcat-servlet-4.0-api
tomcat-jsp-2.3-api
tomcat-el-3.0-api
tomcat-doc
tomcat10-admin-webapps
tomcat10-lib
tomcat10-webapps
tomcat10-jsp-3_1-api
tomcat10-el-5_0-api
tomcat10-servlet-6_0-api
tomcat10
tomcat11-doc
tomcat11-docs-webapp
tomcat11-embed
tomcat11
tomcat11-el-6_0-api
tomcat11-servlet-6_1-api
tomcat11-lib
tomcat11-admin-webapps
tomcat11-jsp-4_0-api
tomcat11-webapps
tomcat11-jsvc

How to mitigate CVE-2026-55956

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.119, 10.1.56, 11.0.23
tomcat-help - update to 9.0.119-1
tomcat - update to 9.0.119-1
tomcat-jsvc - update to 9.0.119-1
tomcat-lib - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-docs-webapp - update to 9.0.119-3.169.1
tomcat-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-el-3_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-jsp-2_3-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-servlet-4_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-javadoc - update to 9.0.119-3.169.1
tomcat-admin-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-webapps - update to 9.0.120-1
tomcat-servlet-4.0-api - update to 9.0.120-1
tomcat-lib - update to 9.0.120-1
tomcat-jsp-2.3-api - update to 9.0.120-1
tomcat-el-3.0-api - update to 9.0.120-1
tomcat-docs-webapp - update to 9.0.120-1
tomcat-doc - update to 9.0.120-1
tomcat-admin-webapps - update to 9.0.120-1
tomcat - update to 9.0.120-1
tomcat10-admin-webapps - update to 10.1.56-150200.5.70.1
tomcat10-lib - update to 10.1.56-150200.5.70.1
tomcat10-webapps - update to 10.1.56-150200.5.70.1
tomcat10-jsp-3_1-api - update to 10.1.56-150200.5.70.1
tomcat10-el-5_0-api - update to 10.1.56-150200.5.70.1
tomcat10-servlet-6_0-api - update to 10.1.56-150200.5.70.1
tomcat10 - update to 10.1.56-150200.5.70.1
tomcat11-doc - update to 11.0.23-150600.13.24.1
tomcat11-docs-webapp - update to 11.0.23-150600.13.24.1
tomcat11-embed - update to 11.0.23-150600.13.24.1
tomcat11 - update to 11.0.23-150600.13.24.1
tomcat11-el-6_0-api - update to 11.0.23-150600.13.24.1
tomcat11-servlet-6_1-api - update to 11.0.23-150600.13.24.1
tomcat11-lib - update to 11.0.23-150600.13.24.1
tomcat11-admin-webapps - update to 11.0.23-150600.13.24.1
tomcat11-jsp-4_0-api - update to 11.0.23-150600.13.24.1
tomcat11-webapps - update to 11.0.23-150600.13.24.1
tomcat11-jsvc - update to 11.0.23-150600.13.24.1

External References

Related Security Bulletins