GMS-2022-1097: Reflected XSS on clients-registrations endpoint

April 28, 2022

A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak. When a malicious request is sent to the client registration endpoint, the error message is not properly escaped, allowing an attacker to execute malicious scripts into the user’s browser.

References

github.com/advisories/GHSA-m98g-63qj-fp8j
github.com/keycloak/keycloak/security/advisories/GHSA-m98g-63qj-fp8j

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