CVE-2026-33221 LOW

CVE-2026-33221: Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload

Vendor Nhost
Product nhost
Weakness CWE-345
Published March 20, 2026
Last update March 25, 2026
View on NVD All CVEs

CVSS base score

2.1/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 20, 2026 CVE published
March 25, 2026 Record updated

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