[The Upright Man]

i have an answer, wormtail posted the secret online in a forum thus the whole world and their elf knew the secret

orrr...perhaps wormtail told and elf and the elf passed the sexret on, as it is clearly stated that the houseelves have a different magic to wiz and witches, therefore they wont be bound by the annoying prospect of telling the secret

another theory i have is that he told the secret w/o actually saying wot it was, as he could answer simply yes or no and under the veritserum (??) he could not lie, thus allowing the secret to be told...a bit like chardes or 20 questions...