Upon detecting the breach, PlaySpan locked all accounts and closed the PlaySpan Marketplace. The company is asking users to reset their passwords while the firm investigates the hack; it also encourages folks urges folks to reset passwords on other websites as a precaution.
A PlaySpan spokesperson stated, "We sincerely apologize for any frustration or inconvenience this incident has caused our customers. We know PlaySpan's business depends on consumer trust. Security is a top priority for us, and we are redoubling our efforts to strengthen PlaySpan's overall system security."
[Thanks to Chris for the tip!]
[Update: We've removed EVE Online, Guild Wars, and RuneScape from the list of compromised games as they were not affected as Develop originally reported. CCP has released a statement denying that it shares customer information with PlaySpan; ArenaNet has likewise posted that it does not use PlaySpan for its games. Turbine has likewise confirmed that contrary to rumor, "Turbine game accounts are not connected to the Playspan Marketplace".]