CVE-2026-50229: Apache Tomcat XSS in number guess example

CVE-2026-50229 · Severity: medium · CVSS 6.1 · Published 2026-06-29

A cross-site scripting (XSS) vulnerability exists in the 'number guess' example application bundled with Apache Tomcat. While this is a sample application and not part of the core server functionality, if it is deployed on a production server, an attacker could potentially execute malicious scripts in a user's browser. This could lead to unauthorized actions being performed in the context of the user's session.

Technologies: org.apache.tomcat:tomcat (Maven). Vendors: Maven.

Quick answers

Is CVE-2026-50229 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50229 being exploited in the wild.
How severe is CVE-2026-50229?
Medium severity, with a CVSS score of 6.1, published 29 June 2026.
Which products and versions are affected?
org.apache.tomcat:tomcat (Maven) >= 11.0.0-M1, < 11.0.23, ECOSYSTEM:introduced=11.0.0-M1,fixed=11.0.23.
Is there a fix for CVE-2026-50229?
Yes. org.apache.tomcat:tomcat (Maven): upgrade to 11.0.23 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-50229 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-50229?
Check whether you run org.apache.tomcat:tomcat (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.apache.tomcat:tomcat (Maven): upgrade to 11.0.23 or later
    # set org.apache.tomcat:tomcat to 11.0.23 in your pom.xml or build.gradle

Technical details

A basic Cross-Site Scripting (XSS) vulnerability (CWE-80) exists in the 'number guess' example application included with various versions of Apache Tomcat. The vulnerability stems from the improper neutralization of script-related HTML tags within the web page, allowing an attacker to inject and execute malicious scripts in the context of a victim's browser session. This is a network-based attack that typically requires a user to interact with a malicious link or visit a compromised page. The issue affects multiple major versions including 7.x, 8.x, 9.x, 10.x, and 11.x. Users are advised to upgrade to versions 11.0.23, 10.1.56, 9.0.119, or later to resolve the issue.

Affected products

  • Apache Tomcat 11.0.0-M1 to 11.0.22, 10.1.0-M1 to 10.1.55, 9.0.0.M1 to 9.0.118, 8.5.0 to 8.5.100, 7.0.0 to 7.0.109

Identifiers

  • CVE-2026-50229
  • BIT-TOMCAT-2026-50229
  • GHSA-pg42-rg8c-j886

Timeline

  • 2026-06-29: disclosed
  • 2026-06-29: advisory

References

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