How can I programmatically get the title of Microsoft knowledge base article by KB number?
For hotfixes released after August 2017, the new API link appears to be https://support.microsoft.com/app/content/api/content/help/en-us/4034733.
For hotfixes released after February 2017, the new API link appears to be https://support.microsoft.com/api/content/help/3115489.
The data on that page is JSON:
If you load that JSON data using Python, e.g., then you can find the title and other useful information under "details". In particular,
d["details"]["id"] == u'3115489'
d["details"]["title"] == u'February 7, 2017, update for Office 2013 (KB3115489)'
d["details"]["publishedOn"] == u'2017-02-07T17:05:19.000368Z'
Just for reference, when loading the URL https://support.microsoft.com/kb/3115489 in Chrome with Developer Tools running, the network activity shows an XHR transfer from api/content/help: