BrickLink is back online. The LEGO-owned marketplace for parts, sets and minifigures returned on the evening of 12th November, a week after it was taken offline over “unusual activity on the platform”.

BrickLink has now confirmed that some usernames and IP addresses were accessed, along with a very small number of email addresses. Passwords and payment information were not.

Affected members have already had an email from BrickLink. It describes what happened as a “cyber incident” and says their information was “accessed and disclosed by an unauthorized party”. Postal addresses weren’t disclosed.

BrickLink says members don’t need to do anything at this stage.

The site stayed down while the team contained the issue, worked out how it happened and checked whether any accounts had been compromised. BrickLink says it has now fixed the problem and will keep a close eye on the platform.

It has also found no evidence that orders, wanted lists, messages or store inventories were lost or changed.

For sellers, BrickLink is waiving fees for November and December as “a gesture of appreciation for sellers’ patience”. No invoices will go out for either month.

That covers around 18,750 stores that couldn’t trade for the whole week, in what many sellers say is their busiest month. Simon Webster of DSLS Bricks told Brick Fanatics his overall sales revenue was down 52% on the same four days last November, while his sales on Brick Owl were up 79%.

The BrickLink Studio forum is still offline, with more information due over the coming days. Anyone who spots a problem with their account, inventory or orders is being asked to contact BrickLink Support.