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Klaviyo: Cloudflare incident disrupting onsite events

Impact: majorStatus: resolvedStarted Resolved (5.1 h)3 updatesSource: stspg.io (opens in new tab)
Summary

Klaviyo reported a major Cloudflare-related outage: onsite forms appeared, but requests, events and subscriptions did not process; preference pages errored and API calls returned 403s. It started 2025-11-18 13:58 UTC and resolved 2025-11-18 19:06 UTC, lasting 5 h 7 min. Fixes were implemented, and all affected components were operational at resolution.

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

Affected components: Consent PagesUnsubscribe & Preference PagesSign-up FormsSignup FormsListsList SubscriptionKlaviyo APIServer-side

Timeline of updates

  1. identified

    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.

  2. monitoring

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

  3. resolved

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

Rewindex changes for this incident

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Klaviyo profile · Recent Klaviyo incidents · Markdown · JSON