Apache Tomcat (<=11.0.22) Basic XSS in Number Guess Example - CVE-2026-50229
CVE-2026-50229 Published on June 29, 2026
Apache Tomcat: XSS in number guess example
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.
Weakness Type
What is a Basic XSS Vulnerability?
The software 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. This may allow such characters to be treated as control characters, which are executed client-side in the context of the user's session. Although this can be classified as an injection problem, the more pertinent issue is the improper conversion of such special characters to respective context-appropriate entities before displaying them to the user.
CVE-2026-50229 has been classified to as a Basic XSS vulnerability or weakness.
Products Associated with CVE-2026-50229
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.0-M1, <= 11.0.22 is affected.
- Version 10.1.0-M1, <= 10.1.55 is affected.
- Version 9.0.0.M1, <= 9.0.118 is affected.
- Version 8.5.0, <= 8.5.100 is affected.
- Version 7.0.0, <= 7.0.109 is affected.
- Before 7.0.0 is unknown.