Klaviyo experienced a minor incident on December 5, 2025, lasting —. The incident has been resolved; the full update timeline is below.
Update timeline
- monitoring Dec 05, 2025, 09:00 AM UTC
Dec 5, 04:00 EST Resolved - Between 3:48am (US Eastern) and 4:10am (US Eastern) Cloudflare experienced an outage which affected Klaviyo. During this time, users were unable to access Klaviyo.com and all Klaviyo APIs. During this window, a number of services were affected. Subscription events and click tracking events were lost. Outbound campaign message sending was not affected. Klaviyo is now fully operational and this incident has been resolved. https://www.cloudflarestatus.com/incidents/k9ppxftx8bs5