CVE-2026-50229: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number gues

This month

MEDIUM 6.1WATCHLISTUPGRADE

CVE-2026-50229 is a medium-severity flaw (CVSS 6.1) affecting tomcat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, 1

Why this priority

EPSS top 9%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-80
Published	2026-06-29
Last modified	2026-10-25

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-29 21:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

apache tomcat UPGRADE

Affected: <= 7.0.109 · >= 8.5.0 and <= 8.5.100 · >= 9.0.0 and < 9.0.119 · >= 10.1.0 and < 10.1.56 · >= 11.0.0 and < 11.0.23

Fixed in: 9.0.119, 10.1.56, 11.0.23

Safe to downgrade to: a release before 8.5.0

1. Check installed version

apt-cache policy tomcat || rpm -q tomcat || tomcat --version

2. UPGRADE to 9.0.119 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tomcat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tomcat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.5.0 (Debian / Ubuntu)

apt-cache madison tomcat sudo apt install tomcat=<VERSION_BEFORE_8.5.0> sudo apt-mark hold tomcat

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tomcat sudo dnf downgrade tomcat-<VERSION_BEFORE_8.5.0> sudo dnf versionlock add tomcat

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Apache Tomcat - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-50229?

tomcat: upgrade to 9.0.119, 10.1.56, 11.0.23. Exact commands for each OS are on this page.

Is CVE-2026-50229 being exploited?

CVE-2026-50229 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-50229 affect?

CVE-2026-50229 affects tomcat. Severity is medium (CVSS 6.1). 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, fr

How urgent is CVE-2026-50229?

Priority 49/100. EPSS top 9%: very likely to be exploited; On your watchlist

Software pages

Apache Tomcat vulnerabilities

Related CVEs

CVE-2026-43512 CRITICAL 9.8 UPGRADE DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue
CVE-2026-55957 HIGH 7.3 UPGRADE Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to au
CVE-2026-53434 CRITICAL 9.1 UPGRADE Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM bas
CVE-2026-55276 CRITICAL 9.1 UPGRADE Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty
CVE-2026-53404 HIGH 7.3 UPGRADE Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the

References

← Back to latest CVEs