OpenAM SAML2 Cluster Cookie-Hash-Redirect Path has Pre-authentication Reflected XSS via `FSUtils.postToTarget`

Description

## Summary Certain federation endpoints do not consistently apply output encoding when rendering user-supplied parameters into HTML responses. Under a non-default configuration used in some clustered deployments, this inconsistency can result in reflected XSS in the OpenAM origin without authentication.

Affected Packages (1)