Cloudflare incident disrupting onsite events

What to do

• Check whether you use Klaviyo Server-side, Sign-up Forms, Lists, Consent Pages in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 5h 7m it lasted.

  Anything that failed between 2025-11-18 13:58 UTC and 2025-11-18 19:06 UTC may need a replay.

• Subscribe to Klaviyo's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=klaviyo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Klaviyo 3

1. identifiedNov 18, 2025, 1:58 PM UTC

   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.

   provider

2. monitoringNov 18, 2025, 2:34 PM UTC

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

   provider

3. resolvedNov 18, 2025, 7:06 PM UTC

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

   provider

Corrections

None so far.

Something wrong on this page? Report an error or send us a note. Every fix is listed here.