How severe is CVE-2026-50229?

CVE-2026-50229 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2026-50229?

CVE-2026-50229 affects the following packages: org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven). Ecosystems affected: Maven.

How do I fix CVE-2026-50229?

Update org.apache.tomcat:tomcat to 11.0.23 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-50229 is resolved across your whole dependency graph.

How do I detect CVE-2026-50229 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-50229 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2026-50229 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-50229 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-50229?

CVE-2026-50229 has an EPSS (Exploit Prediction Scoring System) score of 4.1%, placing it in the 91th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-50229?

CVE-2026-50229 is classified as CWE-80 (CWE-80). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2026-50229?

A Nuclei detection template exists for CVE-2026-50229, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2026-50229 published, and has it been updated?

CVE-2026-50229 was published on June 29, 2026 and was last updated on November 4, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2026-50229 — tomcat

MEDIUMFix: apache/tomcat@0d5bdd5

CVE-2026-50229 is a medium-severity (CVSS 6.1) CWE-80 vulnerability in org.apache.tomcat:tomcat. A fix is available for org.apache.tomcat:tomcat — see the affected versions and patch details below.

Apache Tomcat: XSS in number guess example

Also known asBIT-tomcat-2026-50229GHSA-pg42-rg8c-j886

Published

Jun 29, 2026

Updated

Nov 4, 2026

Affected

5 pkgs

Patched

3 / 5

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-50229.

EPSS Exploitation Probability

via FIRST.org ↗

4.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

5 pkgs affected

☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

5 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.tomcat:tomcat`	≥ 11.0.0-M1&&< 11.0.23	11.0.23`org.apache.tomcat:tomcat:11.0.23`
☕Maven	`org.apache.tomcat:tomcat`	≥ 10.1.0-M1&&< 10.1.56	10.1.56`org.apache.tomcat:tomcat:10.1.56`
☕Maven	`org.apache.tomcat:tomcat`	≥ 9.0.0.M1&&< 9.0.119	9.0.119`org.apache.tomcat:tomcat:9.0.119`
☕Maven	`org.apache.tomcat:tomcat`	≥ 8.5.0	No fix
☕Maven	`org.apache.tomcat:tomcat`	all versions	No fix

Affected Products

1 product · 5 configurations

Application

tomcatapache

≥ 11.0.0 && ≤ 8.5.100

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tomcat:tomcat to 11.0.23 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-50229 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

How to detect CVE-2026-50229

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2026-50229 -u https://target

Template: Apache Tomcat - Cross-Site Scripting
Severity: medium
Impact: Remote attackers can execute scripts in users' browsers, potentially stealing cookies or performing actions on behalf of users.
Remediation: Upgrade to versions 11.0.23, 10.1.56, or 9.0.119 or later.

Template by ProjectDiscovery nuclei-templates (yshahinzadeh, amirmsafari), MIT licensed. View the full template. Scan only systems you are authorised to test.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

A flaw was found in Apache Tomcat. A Cross-Site Scripting (XSS) vulnerability exists in the "number guess" example web application shipped with Tomcat. An attacker can inject malicious scripts into the example page, which execute in other users' browsers when they view the page. This vulnerability only affects the…

Workaround published by Red Hat

Remove or disable the Tomcat example web applications if they are deployed. Example applications are not needed for production use and should not be accessible in production environments.

Source: Red Hat security advisory for CVE-2026-50229 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Enterprise Linux 10	`tomcat9-1:9.0.120-1.el10_2`	RHSA-2026:68651
Red Hat Enterprise Linux 10.0 Extended Update Support	`tomcat9-1:9.0.120-1.el10_0`	RHSA-2026:67163
Red Hat Enterprise Linux 8	`tomcat-1:9.0.120-1.el8_10`	RHSA-2026:68677
Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`tomcat-1:9.0.120-1.el8_8`	RHSA-2026:68680
Red Hat Enterprise Linux 9	`tomcat-1:9.0.120-2.el9_8`	RHSA-2026:68660
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	`tomcat-1:9.0.120-1.el9_2`	RHSA-2026:68678
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	`tomcat-1:9.0.120-1.el9_4`	RHSA-2026:68679
Red Hat Enterprise Linux 9.6 Extended Update Support	`tomcat-1:9.0.120-1.el9_6`	RHSA-2026:68659

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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