Movable Type Security Updates: 5.1, 5.05, 4.36
The impact of the vulnerabilities
A remote attacker could execute arbitrary code in a logged-in users' web browser. A remote attacker could read or modify the contents in the system under certain circumstances. via MT.org
We will be reaching out to existing clients to schedule upgrades. If you'd like Heideldesign to upgrade your Movable Type installation, please contact us.