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Klaviyo: Outbound Webhook Delays

MajorStatus: resolvededitedStarted Resolved (15 h)3 updatesstatus.klaviyo.com (opens in new tab)
Summary

Klaviyo reported a major Analytics incident starting 2026-10-22 22:20 UTC: some customers and connected third-party apps experienced event webhook delivery delays. New webhook processing was temporarily paused, earlier webhooks continued arriving late, and webhook data was retained; flow webhook actions were unaffected. The incident remained open when archived, with 0 minutes elapsed at the last update.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Analytics

Timeline of updates

  1. identified

    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.

  2. monitoring

    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.

  3. resolved

    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.

Changes Rewindex caught on this incident

Archive proof

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How the archive is checked, and what it cannot prove.

Impact, status and times are the vendor’s own, as last archived. View on status.klaviyo.com (opens in new tab).

Cite this

Status incident (vendor impact label: major) posted by Klaviyo, started 2026-10-22 22:20 UTC, resolved after 15 h, 3 update(s); edited after publishing.

Title
Outbound Webhook Delays
Vendor
Klaviyo
Date
URL
https://rewindex.com/company/klaviyo/incidents/nj25d3gpt40s

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