What they said on Github
"It is important that you update your Scatter Desktop immediately.
Once the downloads for the bugfix version reach sufficient numbers we will issue a statement about exactly why this fix was applied, but until then we can't give out any specifics as this is a vulnerability patch.
The vulnerability was brought to our attention by a whitehat (who is working with Team Greymass on an initiative to keep the entire EOS ecosystem safe) an hour ago, and was patched immediately.
If you haven't already, vote for Greymass."
link https://github.com/GetScatter/ScatterDesktop/releases/tag/9.6.1