CVE-2020-10776 Cross-site Scripting in keycloak

What is CVE-2020-10776?

CVE-2020-10776 is a medium-severity cross-site scripting vulnerability in Redhat Keycloak, published on 17 Nov 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

A flaw was found in Keycloak before version 12.0.0, where it is possible to add unsafe schemes for the redirect_uri parameter. This flaw allows an attacker to perform a Cross-site scripting attack.

Weakness: CWE-79

Which versions are affected by CVE-2020-10776?

4 open source packages ship an affected version, including org.keycloak:keycloak-server-spi-private and org.keycloak:keycloak-services. It affects 1 product.

Products include Redhat Keycloak.

How do I fix CVE-2020-10776?

Upgrade org.keycloak:keycloak-server-spi-private to 12.0.0 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-2020-10776 being exploited?

There is no known exploitation of CVE-2020-10776 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-484q-784p-8m5h.