The newly highlighted PRSSI vulnerability (see, which has been present (latent, unknown, unmitigated and waiting to be exploited) in many existing web applications, can result in devastating security impacts which are just as severe as Cross-Site Scripting (XSS). Please spread the word to anyone involved in developing and testing web applications to ensure that the PRSSI vulnerability is eliminated by design in future projects and retrospectively mitigated in any live web applications.