A data breach at the ticketing service Ticketfly is affecting several Portland venues, one more than others.

Space Gallery, an art and music space on Congress Street, uses Ticketfly for its online transactions. A phone message and email to Space were unanswered Monday, but the venue did post a message on its website asking customers to buy tickets at the door instead of online.

“Please note Ticketfly has had a significant problem with their website, tickets will be sold at the door first-come first-serve,” read the message, posted with information about Monday’s scheduled concert by Nnamdi Ogbonnaya, a multi-instrumentalist from Chicago. The venue has three other musical performances this week.

The breach at Ticketfly, which is owned by Eventbrite, first became public last Thursday. Have I Been Pwned, a website that tracks database breaches, said the hack affected more than 26 million user accounts, which included addresses and phone numbers but not credit card information or passwords. As of Monday afternoon, the Ticketfly website was still offline.

Most other Portland venues use Ticketmaster for online ticket transactions, but some were slightly affected nonetheless.

The State Theatre, Port City Music Hall and Thompson’s Point all use Ticketfly to host their event websites, but not for any ticket-buying transactions, said Lauren Wayne, general manager of the venues. Tickets are sold on the venues’ website through Ticketmaster.

Because of that, Wayne said, none of the venues’ customers had their personal information breached. But because Ticketfly was hosting the website for the three venues, their website was down over the weekend while being rebuilt. It was back online Monday with a new look and with ticket-purchasing through Ticketmaster.