Is it possible to hack into a steam account/make someone accept a trade?

[Quck]

Is it possible to hack into someone's steam account without knowing their e-mail? I have a guy on my friends list who has a load of cool TF2 items that I could use/sell and he doesn't come on steam any more. Well he does like once a month and he won't let me have them so I thought if there was a way to log into his account and accept the trade or have a program to force him to accept the trade or anything.

[voxal123]

It's kind've possible, somebody managed to get my "Username" and "Password,"
I'm guessing these hackers are pros at getting usernames and passwords, but i'm smart enough to not fall for that, It was very suspicious for me, but there has to be a HACK, I'm only 11 and i also managed to get someones username and password, Well, I'm guessing its possible to do that hack.

[OblivionGunner99]

People can use brute force crackers on the email and once you have the email your golden

[Law]

You can but you would need to:
-Get an access code from their computer (Trick them into Team-Viewer)
-When they leave their computer trade yourself..
So, unless they are braindead enough to let you TeamView them then leave you alone on their computer; nope.

[Ex3cutioner]

If you want to do that, might as well just hack their entire account.
get their user and pass for steam (and for their email)
log into steam with their acc
log in to their email and get security code
enter security code
accept your own trade
????
Profit

Don't do it btw you're gunna get caught real easy. Especially since if they report it they'll see who they traded with. (you)

[T[M]T]

Eh, due to SteamGuard it will be tricky because it will ask for a verification because you are logging into this persons account with a new IP Address.