CVE-2026-33221

Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload

Published: Mar 20, 2026Updated: Jun 3, 2026 Sources: CVE List NVDCWE-343

5.3MEDIUM

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-343 CWE-345

Affected Products

nhost

commercialaka nhost/auth, nhost cli

storageSaaS

Cloud & SaaS / api-gateway

nhostSaaS

Cloud & SaaS / api-gateway

Exploitability

Official Patch Available

Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85

github.com

https://github.com/nhost/nhost/pull/4018

github.com

https://github.com/nhost/nhost/releases/tag/storage%400.12.0

github.com

and 1 more references View all →

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