On the eve of Comixology’s appearance at SXSW Interactive, the annual tech festival, the digital comics vendor has discovered a security breach and urged all its subscribers to change their passwords. Early this morning Comixology sent a letter to subscribers to alert them it had been hacked.

Subscribers are urged to change their Comixology passwords but to also change passwords at other accounts that may use the same password. In the note that went out early this morning, Comixology said:

“In the course of a recent review and upgrade of our security infrastructure, we determined that an unauthorized individual accessed a database of ours that contained usernames, email addresses, and cryptographically protected passwords. Payment account information is not stored on our servers.

Even though we store our passwords in protected form, as a precautionary measure we are requiring all users to change their passwords on the comiXology platform and recommend that you promptly change your password on any other website where you use the same or a similar password.”

Comixology Subscribers can Change their Passwords here.