CVE-2023-6134 Keycloak: reflected xss via wildcard in oidc redirect_uri

What is CVE-2023-6134?

CVE-2023-6134 is a medium-severity cross-site scripting vulnerability in Redhat Keycloak, published on 14 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748.

Weakness: CWE-79

Which versions are affected by CVE-2023-6134?

2 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 5 products.

Products include Redhat Keycloak, Redhat Openshift Container Platform, Redhat Openshift Container Platform for Power, Redhat Openshift Container Platform Ibm Z Systems, Redhat Single Sign-On.

How do I fix CVE-2023-6134?

Upgrade org.keycloak:keycloak-services to 23.0.3 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-2023-6134 being exploited?

There is no known exploitation of CVE-2023-6134 in the wild and no public exploit code.

Other vulnerabilities in Redhat Keycloak

• CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC Critical 10.0
• CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature Critical 9.8
• CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability Critical 9.6
• CVE-2019-14910 Keycloak Authentication Error Critical 9.3
• CVE-2019-14909 Keycloak Authentication Error Critical 9.3

All Redhat Keycloak vulnerabilities

Sources

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

Also known as GHSA-cvg2-7c3j-g36j.