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Outage in Klaviyo

Catalog Webhook Processing Delays

Resolved Minor
July 08, 2026 - Started 16 days ago - Lasted 2 days
Official incident page

Incident Report

Summary AI Generated

Starting July 8, 2026 at 4:00 PM ET, Klaviyo experienced delays in syncing product catalog updates from webhook-based integrations (Shopify, WooCommerce, BigCommerce, Magento, and others), causing product data in email/SMS templates and the Customer Hub to be out of date by up to 4 hours. Webhook processing was intentionally paused between 9:45 PM and 11:13 PM ET on July 8 while engineers worked on a fix, after which real-time syncing resumed. A background repair to backfill records from the impact window completed on July 10 at 5:01 PM ET, fully resolving the incident after approximately 43 hours.

At 4:00 PM US/Eastern on July 8, 2026, we identified delays syncing product updates from integrations using webhooks. This is causing catalog data, including in Templates and the Customer Hub, to not update in real time. Customer may see product data being out of date by up to 4 hours. Sending is not impacted but the product data in templates may not reflect real-time information. We are working to resolve this as quickly as possible and will share another update shortly.

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Latest Updates ( sorted recent to last )
RESOLVED 15 days ago - at 07/10/2026 09:01PM

The repair to catch up on product update webhooks from the window of impact has been completed, and affected product data is up to date. This incident has been resolved.

MONITORING 16 days ago - at 07/09/2026 04:13PM

Product updates from ecommerce integrations are continuing to sync normally in real time. A background repair to fully update records from the earlier impact window (9:45 PM to 11:13 PM US/Eastern on July 8, 2026) is still in progress. We will confirm once this repair is complete.

MONITORING 16 days ago - at 07/09/2026 04:34AM

As of 11:13 PM US/Eastern on July 8, 2026, we have resumed processing webhooks. This means all new webhooks from integrations which use webhooks to update products are now syncing in real time.
Our Engineering Team is working implement a repair to catch up on any product update webhooks from during window of impact (9:45 PM and 11:13 PM US/Eastern July 8, 2026). We will confirm once the repair has been complete and the incident has been fully resolved.

IDENTIFIED 16 days ago - at 07/09/2026 03:14AM

As of 9:45 PM US/Eastern on July 8, 2026, we paused processing new webhooks for product catalogs while we continue working on a fix. Catalog data, including in Templates and Customer Hub, will remain out of date until syncing resumes.

Our engineering team is actively working to restore realtime catalog updates. We'll provide updates as soon as more information is available.

INVESTIGATING 16 days ago - at 07/09/2026 01:52AM

At 4:00 PM US/Eastern on July 8, 2026, we identified delays syncing product updates from integrations using webhooks. This is causing catalog data, including in Templates and the Customer Hub, to not update in real time. Customer may see product data being out of date by up to 4 hours. Sending is not impacted but the product data in templates may not reflect real-time information.

We are working to resolve this as quickly as possible and will share another update shortly.

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