Cross-site scripting in Apache Tomcat - CVE-2026-50229
Published: June 30, 2026
Vulnerability identifier: #VU135867
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50229
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Tomcat
Apache Tomcat
Detailed vulnerability description
The vulnerability allows a remote attacker to execute cross-site scripting.
The vulnerability exists due to cross-site scripting in the number guess example when using wild card property mapping that exposes internal properties to clients. A remote attacker can supply crafted input that is reflected through exposed properties to execute cross-site scripting.
The issue is limited to the number guess example application.
How to mitigate CVE-2026-50229
Install security update from vendor's website.
Sources
- https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.56
- https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.23
- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.119
- https://github.com/apache/tomcat/commit/0d5bdd5b0dd964e9f73e530b7d753462b9bfd1d0