CVE-2026-50229

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.

Affected

Apache Software Foundation · Apache Tomcat

CVSS v3.1 CNA

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

4.09% chance of exploitation in the next 30 days, 91st percentile

Nuclei

medium · CWE-80

Published

2026-06-29

Updated

2026-06-30

Proof-of-concept exploits (1)

• flvzx/CVE-2026-50229

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-50229.yaml

Security advisories

• https://lists.apache.org/thread/wlt2no8bw45zl1w8byop4zfqphldf5j0
• http://www.openwall.com/lists/oss-security/2026/06/29/20

References

• CVE Record
• NVD entry