Contentful change history: CORS errors on CDA

Contentful reported a major incident affecting some customers: CORS preflight failures for browser requests to cross-space references on CDA, including EU data residency. It started at 2026-09-29 14:39 UTC and was resolved at 2026-09-29 15:44 UTC, lasting 1 h 5 min; Contentful identified the cause but did not disclose it or the fix.