Cloudflare experiences global Dashboard and Cloudflare API service issues affecting Optimizely services
Incident
Report for Optimizely Service
Postmortem
Cloudflare service issues, impacting multiple Optimizely services - December 5, 2025
An initial root cause has been provided by our third-party vendor, Cloudflare, https://www.cloudflarestatus.com/incidents/lfrm31y6sw9q
A recent change to how Cloudflare’s Web Application Firewall parses requests temporarily caused portions of Cloudflare’s network to become unavailable. The issue lasted from December 05, 2025 - 08:56 (UTC) to December 05, 2025 - 09:12 (UTC).
Cloudflare informs that this was not an attack; the change was deployed to help mitigate the industry-wide vulnerability disclosed this week in React Server Components.
For the final Post Mortem of the Cloudflare outage on December 5, 2025, we refer to Cloudflare's published Post Mortem, https://blog.cloudflare.com/5-december-2025-outage/
Resolved
Optimizely’s monitoring confirm continuous service health since 09:12 (UTC). Incident Resolved.
Update
Cloudflare Resolved their incident. We continue close monitoring of Optimizely service health.
Monitoring
A fix has been implemented by Cloudflare. We are monitoring the results.
Investigating
Cloudflare experiences global Dashboard and Cloudflare API service issues affecting Optimizely services. Further detail will be provided as more information becomes available.
This incident affected: Search and Navigation - APAC Region (Singapore, Australia East), Search and Navigation - EMEA Region (Norway East, Sweden Central, UK South, North Europe), Search and Navigation - NA Region (Canada East, US East, US West), Optimizely Public Websites (Optimizely main website - Optimizely.com, World Developer Forum - world.optimizely.com, Nuget CMS/Commerce package feed - nuget.optimizely.com, Search & Navigation Demo Portal - find.optimizely.com), and Optimizely Support (Support Portal - optimizely.com/support).