# Contentful: Major incident: CORS errors on CDA

**Summary:** 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. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-29 14:39 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/r044gjmkw13f](https://stspg.io/r044gjmkw13f)
- [Company: Contentful](https://rewindex.com/company/contentful.md)
- Versions: before (none: first archived) → after incident\_version:183/1f3x23l45483@c5075dfe491e
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ CORS errors on CDA
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-29 14:39 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-29 15:44 UTC
```

**6. Added: Affected components**

```diff
+ Content Delivery API, EU data residency - Content Delivery API
```

**7. Added: Update** (identified) · 2026-09-29 14:39 UTC

```diff
+ Some customers are seeing CORS preflight failures when requesting cross-space references on CDA through webbrowsers. We've identified the cause and are working on resolution.
```

**8. Added: Update** (monitoring) · 2026-09-29 15:16 UTC

```diff
+ The issue has been resolved. We are monitoring the situation.
```

**9. Added: Update** (resolved) · 2026-09-29 15:44 UTC

```diff
+ The issue has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-29 14:39 UTC | Major incident: CORS errors on CDA (this change) | outage |

All Contentful changes: [timeline](https://rewindex.com/company/contentful/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i60bc84e59de3a3 · Markdown: https://rewindex.com/change/i60bc84e59de3a3.md · JSON: https://rewindex.com/api/v1/changes/i60bc84e59de3a3 · Generated 2026-10-18T02:28:08.336Z