In reply to John Teague.

@John Teague, I am glad that this update did not break any of yours site. But I run sites that are very high traffic and rely on shortcodes for most of the content on the site. Those sites broke, they stopped displaying content. And has been pointed out elsewhere, there was next to ZERO chance that particular exploit could be used on our sites. So, the update was NOT critical enough to break them.

I am THRILLED that the core team will be more forthcoming on posting the details regarding security updates as soon as they are released. It would have saved me 3 to 4 hours of figuring out the problem on my own and coding my own solution. But I think the decision itself to fix a mostly non-issue and deliberately break sites was wrong. And erodes my confidence in Core and the process.