Popular security outfit Avast sent an apologetic email this morning to users of its forum saying that the latter had been compromised.
The company took down the forum and is rebuilding it; until now it used a third-party forum called Simple Machines Forum (SMF).
We contacted SMF and are awaiting to hear from them; a cached version of the forum is still available on Google.
Avast's COO, Ondrej Vleck, confirmed that it was hacked over the past weekend and "user nicknames, user names, email addresses and hashed (one-way encrypted) passwords" were compromised.