CVE-2026-50229 Apache Tomcat: XSS in number guess example
An attacker can execute arbitrary scripts in the browser of a user interacting with the number guess example in Apache Tomcat.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-50229?
CVE-2026-50229 is a medium-severity cross-site scripting vulnerability in Apache Tomcat, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-80
Which versions are affected by CVE-2026-50229?
1 open source package ship an affected version, including tomcat. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
tomcat Bitnami | All versions | 9.0.101, 10.1.37, 11.0.5 |
Products include Apache Tomcat.
How do I fix CVE-2026-50229?
Upgrade tomcat to a fixed version for your release line: 9.0.101, 10.1.37 or 11.0.5.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-50229 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50229 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Tomcat
Sources
Also known as BIT-tomcat-2026-50229, DEBIAN-CVE-2026-50229, GHSA-pg42-rg8c-j886, UBUNTU-CVE-2026-50229.