A cross-site scripting (XSS) flaw was found in RESTEasy, where it did not properly handle URL encoding when calling @javax.ws.rs.PathParam without any @Produces MediaType. An attacker could use this flaw to launch a reflected XSS attack.

A flaw was found in RESTEasy in all versions of RESTEasy up to 4.6.0.Final. The endpoint class and method names are returned as part of the exception response when RESTEasy cannot convert one of the request URI path or query values to the matching JAX-RS resource method's parameter value. The highest threat from this vulnerability is to data confidentiality.