CVE-2023-6717: Keycloak Cross-site Scripting (XSS) via assertion consumer service URL in SAML POST-binding flow

April 17, 2024

Keycloak allows arbitrary URLs as SAML Assertion Consumer Service POST Binding URL (ACS), including JavaScript URIs (javascript:).

Allowing JavaScript URIs in combination with HTML forms leads to JavaScript evaluation in the context of the embedding origin on form submission.

References

github.com/advisories/GHSA-8rmm-gm28-pj8q
github.com/keycloak/keycloak
github.com/keycloak/keycloak/security/advisories/GHSA-8rmm-gm28-pj8q
nvd.nist.gov/vuln/detail/CVE-2023-6717

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