CVE-2017-12158 Keycloak Reflected XSS

What is CVE-2017-12158?

CVE-2017-12158 is a medium-severity cross-site scripting vulnerability in Red Hat, Inc. keycloak, published on 26 Oct 2017. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

Weakness: CWE-79, CWE-444

Which versions are affected by CVE-2017-12158?

2 open source packages ship an affected version, including org.keycloak:keycloak-parent. It affects 2 products.

Products include Keycloak Keycloak, Redhat Single Sign On.

How do I fix CVE-2017-12158?

Upgrade org.keycloak:keycloak-parent to 3.4.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2017-12158 being exploited?

There is no known exploitation of CVE-2017-12158 in the wild and no public exploit code.

Other vulnerabilities in Red Hat, Inc. keycloak

• CVE-2017-12161 Moderate severity vulnerability that affects org.keycloak:keycloak-core High 8.8
• CVE-2014-3709 JBoss Keycloak CSRF Vulnerability High 8.8
• CVE-2014-3651 Keycloak vulnerable to uncontrolled resource consumption High 7.5
• CVE-2017-12159 Keycloak CSRF Vulnerability High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-IW40503, GHSA-v38p-mqq3-m6v5, MINI-2v2m-r65g-8m3q, MINI-vpp2-gqh7-fg69.