We have released a patch file to fix the following problem. This is not a security problems.
A line wrapping is not work if you use the other than rich text as a text format in the latest Google Chrome and Firefox.
Please apply patch file. This patch file is available for Movable Type 6.2.x and 6.1.x versions only.
The patch file contains a file named “mt-static/plugins/TinyMCE/lib/js/adapter.js”. Please replace the same name on your servers.