inside information
details
tattle
babble
babble out
blab out
sing
blab
talk
spill the beans
peach
let the cat out of the bag
confidentialised
nonconfidential
skinny
leak
news leak
confidentially
blag
blabbermouthed
talebearing
leaky
tattling
know where the bodies are buried
confidentiality
doc drop
confidentialness
superarcane
hush-hush
infosec
keep quiet
keep one's mouth shut
shut one's mouth
shoot off at the mouth
unconfidential
open the kimono
privily
underhand
hole-and-corner
mum
professional secrecy
closemouthed
closelipped
close
secretive
tightlipped
let in on
kleptography
under one's hat
privilege