CVE-2026-33221: Nhost Storage

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Nhost is an open source Firebase alternative with GraphQL. Prior to version 0.12.0, the storage service's file upload handler trusts the client-provided Content-Type header without performing server-side MIME type detection. This allows an attacker to upload files with an arbitrary MIME type, bypassing any MIME-type-based restrictions configured on storage buckets. This issue has been patched in version 0.12.0.

Affected products

• Nhost Storage: before 0.12.0 (fixed in 0.12.0)

Published 2026-03-20. Last modified 2026-06-17.