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CVE-2026-55956— Apache Tomcat: Security constraints for default servlet ignored method

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Software Foundation Apache Tomcat是Apache Software Foundation基金会的应用服务器。 Apache Tomcat存在授权问题漏洞，该漏洞源于授权不当，导致为默认servlet指定的安全约束忽略配置的方法或方法省略。

AI Predicted 7.5 Difficulty: Easy EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 6

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.22 affected
10.1.0-M1≤ 10.1.55 affected
9.0.0.M1≤ 9.0.118 affected
8.5.0≤ 8.5.100 affected
7.0.0≤ 7.0.109 affected
< 7.0.0 unknown
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I. Basic Information for CVE-2026-55956

Vulnerability Information
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Vulnerability Title
Apache Tomcat: Security constraints for default servlet ignored method
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Software Foundation Apache Tomcat是Apache Software Foundation基金会的应用服务器。 Apache Tomcat存在授权问题漏洞，该漏洞源于授权不当，导致为默认servlet指定的安全约束忽略配置的方法或方法省略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.22 -

II. Public POCs for CVE-2026-55956

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III. Intelligence Information for CVE-2026-55956

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Mailing List Discussions for CVE-2026-55956 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-29 · 7 CVEs total

CVE-2026-55957 Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind
CVE-2026-55955 Apache Tomcat: EncryptInterceptor not protected against replay attacks
CVE-2026-55276 Apache Tomcat: Logged effective web.xml is incomplete
CVE-2026-53434 Apache Tomcat: Invalid CRL configuration doesn't trigger failure for FFM Connector
CVE-2026-53404 Apache Tomcat: Bad ornext processing in RewriteValve
CVE-2026-50229 Apache Tomcat: XSS in number guess example

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-285

V. Comments for CVE-2026-55956

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