LINE 4.3.0.724 and earlier on Windows and 4.3.1 and earlier on OS X allows remote authenticated users to cause a denial of service (application crash) via a crafted post that is mishandled when displaying a Timeline.
LINE 3.2.1.83 and earlier on Windows and 3.2.1 and earlier on OS X does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.