Signed up for Klaviyo? Dozens of advertisers may have seen your password

When reached by TechCrunch, Klaviyo spokesperson Danielle Zanatta confirmed that the bug was related to an “application configuration issue.” Zanatta said the number of known individuals affected was fewer than 200 people, “based on our readily available active logs.” Klaviyo would not say how far back it stores logs, or for how long the bug was active on its website.

Klaviyo said it notified the known individuals affected, but would not provide a copy of the communication that the company allegedly shared with affected customers when asked by TechCrunch. 

It’s unclear why the company did not publicly disclose the incident.