A major vulnerabilty was found in all supported PSA releases. Our developers have released a patch to address this issue for all versions of PSA 2.0.0 - 2.5.5. PSA 5.0.3 addresses the issue for all PSA 5.0.x builds. For obvious security reasons, we will not be disclosing exactly what the issue was. These packages are availible for download from our website, as well as the anonymous FTP. ALL USERS SHOULD PATCH THEIR SERVERS IMMEDIATELY!