Reflected XSS in Apache Tomcat Example

Publication date: 2026-06-29

Last updated on: 2026-06-29

Assigner: Apache Software Foundation

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-29

Last Modified

2026-06-29

Generated

2026-06-30

AI Q&A

2026-06-30

EPSS Evaluated

N/A

NVD

CVE-2026-50229

Affected Vendors & Products

Vendor	Product	Version / Range
apache	tomcat	From 11.0.0-M1 (inc) to 11.0.22 (inc)
apache	tomcat	From 10.1.0-M1 (inc) to 10.1.55 (inc)
apache	tomcat	From 9.0.0.M1 (inc) to 9.0.118 (inc)
apache	tomcat	From 8.5.0 (inc) to 8.5.100 (inc)
apache	tomcat	From 7.0.0 (inc) to 7.0.109 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-80	The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

Attack-Flow Graph

Executive Summary

This vulnerability is an Improper Neutralization of Script-Related HTML Tags in a Web Page, commonly known as a Basic Cross-Site Scripting (XSS) issue. It occurs in the number guess example for Apache Tomcat, where user input is not properly sanitized or neutralized before being included in a web page. This allows an attacker to inject malicious scripts into the web page viewed by other users.

Impact Analysis

This vulnerability can allow attackers to execute malicious scripts in the context of the affected web application. This can lead to unauthorized actions such as stealing user session cookies, defacing web pages, redirecting users to malicious sites, or performing actions on behalf of the user without their consent.

Mitigation Strategies

Users are recommended to upgrade Apache Tomcat to version 11.0.23, 10.1.56, or 9.0.119, which fix the issue.

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