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Not in CISA KEV
HIGH severity

CVE-2022-4137 — keycloak-parent

HIGHFix: keycloak/keycloak#16774

CVE-2022-4137 is a high-severity (CVSS 8.1) CWE-81 vulnerability in org.keycloak:keycloak-parent. A fix is available for org.keycloak:keycloak-parent — see the affected versions and patch details below.

Keycloak Cross-site Scripting on OpenID connect login service

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.03%0.58%1.14%1.69%0.5%1.2%May 26Sep 26Nov 26

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

1 pkg affected
☕org.keycloak:keycloak-parent

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

A reflected cross-site scripting (XSS) vulnerability was found in the 'oob' OAuth endpoint due to incorrect null-byte handling. This issue allows a malicious link to insert an arbitrary URI into a Keycloak error page. This flaw requires a user or administrator to interact with a link in order to be vulnerable. This may compromise user details, allowing it to be changed or collected by an attacker.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.keycloak:keycloak-parentall versions20.0.5org.keycloak:keycloak-parent:20.0.5

Affected Products

2 products · 2 configurations
Application
keycloakredhat
all
Application
single sign-onredhat
1 version
7.6

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update org.keycloak:keycloak-parent to 20.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-4137 is resolved across your whole dependency graph.

  3. 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.

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 HatImportant
ProductFixed inAdvisory
Red Hat Single Sign-On 7rh-sso7-keycloakRHSA-2023:1049
Red Hat Single Sign-On 7.6 for RHEL 7rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el7ssoRHSA-2023:1043
Red Hat Single Sign-On 7.6 for RHEL 8rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el8ssoRHSA-2023:1044
Red Hat Single Sign-On 7.6 for RHEL 9rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el9ssoRHSA-2023:1045

Frequently Asked Questions

A reflected cross-site scripting (XSS) vulnerability was found in the `oob` OAuth endpoint due to incorrect null-byte handling. This issue allows a malicious link to insert an arbitrary URI into a Keycloak error page.
O3 Security · Impact-Aware SCA

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CVE-2022-4137: keycloak-parent XSS — Fixed in 20.0.5