Cross-site scripting in Apache Tomcat - CVE-2026-50229

Vulnerability identifier: #VU135867

CSH Severity: Low

CVSS v4: 5.1 [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]

CVE-ID: CVE-2026-50229

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Apache Tomcat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Web and Scripting Module
openSUSE Leap
Ubuntu
openEuler
Anolis OS
tomcat8 (Ubuntu package)
tomcat-help
tomcat
tomcat-jsvc
tomcat-docs-webapp
tomcat-webapps
tomcat-el-3_0-api
tomcat-jsp-2_3-api
tomcat-servlet-4_0-api
tomcat-javadoc
tomcat-admin-webapps
tomcat-lib
tomcat-servlet-4.0-api
tomcat-jsp-2.3-api
tomcat-el-3.0-api
tomcat-doc
tomcat10-admin-webapps
tomcat10-lib
tomcat10-webapps
tomcat10-jsp-3_1-api
tomcat10-el-5_0-api
tomcat10-servlet-6_0-api
tomcat10
tomcat11-embed
tomcat11-doc
tomcat11-docs-webapp
tomcat11
tomcat11-el-6_0-api
tomcat11-servlet-6_1-api
tomcat11-lib
tomcat11-admin-webapps
tomcat11-jsp-4_0-api
tomcat11-webapps
tomcat11-jsvc

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.119, 10.1.56, 11.0.23
tomcat8 (Ubuntu package) - addressed in versions 8.0.32-1ubuntu1.13+esm2, 8.5.39-1ubuntu1~18.04.3+esm6
tomcat-help - update to 9.0.119-1
tomcat - update to 9.0.119-1
tomcat-jsvc - update to 9.0.119-1
tomcat - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-docs-webapp - update to 9.0.119-3.169.1
tomcat-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-el-3_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-jsp-2_3-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-servlet-4_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-javadoc - update to 9.0.119-3.169.1
tomcat-admin-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-lib - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-webapps - update to 9.0.120-1
tomcat-servlet-4.0-api - update to 9.0.120-1
tomcat-lib - update to 9.0.120-1
tomcat-jsp-2.3-api - update to 9.0.120-1
tomcat-el-3.0-api - update to 9.0.120-1
tomcat-docs-webapp - update to 9.0.120-1
tomcat-doc - update to 9.0.120-1
tomcat-admin-webapps - update to 9.0.120-1
tomcat - update to 9.0.120-1
tomcat10-admin-webapps - update to 10.1.56-150200.5.70.1
tomcat10-lib - update to 10.1.56-150200.5.70.1
tomcat10-webapps - update to 10.1.56-150200.5.70.1
tomcat10-jsp-3_1-api - update to 10.1.56-150200.5.70.1
tomcat10-el-5_0-api - update to 10.1.56-150200.5.70.1
tomcat10-servlet-6_0-api - update to 10.1.56-150200.5.70.1
tomcat10 - update to 10.1.56-150200.5.70.1
tomcat11-embed - update to 11.0.23-150600.13.24.1
tomcat11-doc - update to 11.0.23-150600.13.24.1
tomcat11-docs-webapp - update to 11.0.23-150600.13.24.1
tomcat11 - update to 11.0.23-150600.13.24.1
tomcat11-el-6_0-api - update to 11.0.23-150600.13.24.1
tomcat11-servlet-6_1-api - update to 11.0.23-150600.13.24.1
tomcat11-lib - update to 11.0.23-150600.13.24.1
tomcat11-admin-webapps - update to 11.0.23-150600.13.24.1
tomcat11-jsp-4_0-api - update to 11.0.23-150600.13.24.1
tomcat11-webapps - update to 11.0.23-150600.13.24.1
tomcat11-jsvc - update to 11.0.23-150600.13.24.1

• 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
• https://lists.apache.org/thread/0yx97bhlyqrk7wlrlpgo88jg9yw3n6v2

• Multiple vulnerabilities in Apache Tomcat
• openEuler 24.03 LTS SP3 update for tomcat
• openEuler 24.03 LTS SP1 update for tomcat
• openEuler 22.03 LTS SP4 update for tomcat
• openEuler 20.03 LTS SP4 update for tomcat
• SUSE update for tomcat11
• SUSE update for tomcat
• SUSE update for tomcat10
• Ubuntu update for tomcat8
• SUSE update for tomcat
• Anolis OS update for tomcat