Klaviyo: Cloudflare incident disrupting onsite events
Klaviyo's status page listed this on 19 Nov 2025. Lasted 5.1 h, filed against Server-side, Sign-up Forms, Lists and Consent Pages. This is their record, not a measurement of ours.
What happened
Started
Resolved
Lasted5.1 h
What failedServer-side, Sign-up Forms, Lists and Consent Pages
Their impactMajor
Regions: their page does not say which. Ours checks from three cities, and the screen we saw is on our own incident pages, where there is one.
What Klaviyo said
On their page: Cloudflare incident disrupting onsite events
Klaviyo's status page: “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.”Identified
Klaviyo's status page: “Fixes have been implemented for some services and we are monitoring the issues.”Monitoring
Klaviyo's status page: “This incident has been resolved, as of 2 pm US eastern. All affected components are operational.”Resolved
What our own check saw
Nothing of ours failed that day, which is worth knowing: their incident did not reach the parts we check, or we were not checking Klaviyo yet.
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