In viewing the code for Pages database records, the open graph meta tag og:type is added for each display record:
 

<meta property="og:type" content="object">

This is true of all our different databases records.

I cannot find reference to an og:type of object and should be at least one of the types listed at the open graph spec:
https://ogp.me/#type_article

How do I change or modify the content value?

And where is it coming from so that I can change or specify the correct value: in my case either "website" or "article"

It's in forum threads and blog entries too.

This will be addressed in our upcoming 4.6 release.

Thank you @bfarber

We're using 4.4.x b/c we cannot upgrade until one of our relied upon plugins is updated - which may not be for a long while.

Is this the type of bug that gets retrofitted to a 4.4 release? Though it is technically not security, it is an issue that may cause social data sharing issues.

We would not release a patch for 4.4 to correct this issue I'm afraid, so if you have not updated and don't plan to soon you may need to manually patch your installation to correct the issue, or develop a plugin to do so.