When riding a horse, the player does not take explosion damage

Confirmed.

Unable to reproduce.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

This bug has been fixed in the latest snapshot. I don't know how to delete, so take it away mods!

It had been marked resolved. We don't delete issues in case they resurface, or documentation is needed.