Outage in Klaviyo

Cloudflare incident disrupting onsite events

Resolved Major

November 18, 2025 - Started 5 months ago - Lasted about 5 hours
Official incident page

Incident Report

Cloudflare declared an incident around 6:30 am US Eastern causing all onsite activities, such as unsubscribe and subscribe preference pages and onsite form submissions to error out. Forms appear, but no requests or related events or subscriptions are processing. API calls are also experiencing 403s. https://www.cloudflarestatus.com/incidents/8gmgl950y3h7 We're currently investigating mitigation steps for the affected features.

Components affected

Klaviyo API Klaviyo List Subscription Klaviyo Signup Forms Klaviyo Unsubscribe & Preference Pages

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Latest Updates ( sorted recent to last )

RESOLVED 5 months ago - at 11/18/2025 07:06PM

This incident has been resolved, as of 2 pm US eastern. All affected components are operational.

MONITORING 5 months ago - at 11/18/2025 02:34PM

Fixes have been implemented for some services and we are monitoring the issues.

IDENTIFIED 5 months ago - at 11/18/2025 01:58PM

Cloudflare declared an incident around 6:30 am US Eastern causing all onsite activities, such as unsubscribe and subscribe preference pages and onsite form submissions to error out. Forms appear, but no requests or related events or subscriptions are processing. API calls are also experiencing 403s. https://www.cloudflarestatus.com/incidents/8gmgl950y3h7

We're currently investigating mitigation steps for the affected features.

Latest Klaviyo outages

API 503 Errors - 4 days ago

Real-time segmentation delays - about 1 month ago

Issues with Campaign Sending and Scheduling - 4 months ago

Users with access to multiple accounts being unable to switch accounts - 4 months ago

Data processing delays - 4 months ago

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