Duplicate Advisory: Keycloak exposes sensitive information in Pushed Authorization Requests (PAR)

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-69fp-7c8p-crjr. This link is maintained to preserve external references.

Original Description

A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a request_uri authorization request, possibly leading to an information disclosure vulnerability.