Outbound Webhook Delays

Summary

Outbound Webhook Delays

Event webhook delivery was fully restored at 2:40 AM US/Eastern on October 23, 2026 after the backlog was processed. Webhook data was retained, and webhook actions in flows were not affected. We apologize for the disruption this caused. This incident has been resolved.

• Started

  Oct 22, 2026 · 6:20 PM

• Resolved

  Oct 23, 2026 · 9:06 AM

• Duration

  14h 46m

• Severity

  Major

• ◆

  Identified

  Oct 22 · 6:20 PM Klaviyo

  Some customers and third-party apps connected to Klaviyo accounts are experiencing delays receiving event webhooks. Webhook actions in flows are not affected at this time. To support recovery, we temporarily paused processing of new webhooks at 5:11 PM US/Eastern on October 22, 2026, and earlier webhooks are still being delivered with delays. Webhook data is being retained, and we expect delayed and paused webhooks to be delivered once processing resumes. We are working to resolve this as quickly as possible and will share another update shortly.

• ◉

  Monitoring

  Oct 23 · 12:07 AM Klaviyo

  New event webhooks are being delivered again after processing resumed at 11:28 PM US/Eastern on October 22, 2026. Some customers and third-party apps connected to Klaviyo accounts may continue to see delays while the backlog is processed, and we expect these delays to decrease over time. Webhook data has been retained, and webhook actions in flows are not affected at this time. We continue to monitor closely and appreciate your patience throughout this incident.

• ✓

  Resolved

  Oct 23 · 9:06 AM Klaviyo

  Event webhook delivery was fully restored at 2:40 AM US/Eastern on October 23, 2026 after the backlog was processed. Webhook data was retained, and webhook actions in flows were not affected. We apologize for the disruption this caused. This incident has been resolved.