keycloak-core: open redirect via "form_post.jwt" JARM response mode. An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.
Advisories are based on vulnerability information provided by Grype from Anchore.
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