Movable Type v6.3.9 - Security Patch & The Future of v6.3.x

On April the 16th, Six Apart issued Movable Type v6.3.9 which solves a security issue related to the template object.

They've revised the html escape of the template edit screen.



  • Revises html escape of template edit screen.

Worth mentioning is also the fact that Movable Type v6.3.x is going to end its maintenance period on May 16th, 2019. This means that it is no longer subject to technical support.

Until May 16th, 2020 so in 1 year and 1 month from now, only versions determined to solve serious security issues will be released.

That's not all!

Six Apart released Movable Type v6.5 which is meant to continue the development of Movable Type v6.3.x and which comes with a large number of improvements.

Movable Type v6.5 is subject to LTS (long-term-support) and will get improvements and security fixes until 2022.

Check it out at:


- username: demo

- password: testthis


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This is a personal website and doesn't have anything to do with Six Apart nevertheless Chris Alden, the former Six Apart CEO, appreciated my idea when he saw it available online.