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CVE-2021-20323 PoC — Red Hat Keycloak 跨站脚本漏洞

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20323.yaml
Associated Vulnerability
Title:Red Hat Keycloak 跨站脚本漏洞 (CVE-2021-20323)
Description:A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
Description
Keycloak 10.0.0 to 18.0.0 contains a cross-site scripting vulnerability via the client-registrations endpoint. On a POST request, the application does not sanitize an unknown attribute name before including it in the error response with a 'Content-Type' of text/hml. Once reflected, the response is interpreted as HTML. This can be performed on any realm present on the Keycloak instance. Since the bug requires Content-Type application/json and is submitted via a POST, there is no common path to exploit that has a user impact.
File Snapshot

 id: CVE-2021-20323

info:
  name: Keycloak 10.0.0 - 18.0.0 - Cross-Site Scripting
  author: ndmalc,i

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