Misstep

• WWizards of the Coast2004-10-04
  Official Ruling
  The creatures are only prevented from untapping during the targeted player’s next untap step. They can still can untap during other player’s untap steps.
• WWizards of the Coast2008-08-01
  Official Ruling
  No creature controlled by the player will untap during their next untap step. This includes creatures which entered the battlefield after Misstep resolved.

Rulings via Scryfall