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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
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 93.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
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-343CWE-345

Affected Products

storagenhost
SaaS
Cloud & SaaS / api-gateway
nhostnhost
SaaS
Cloud & SaaS / api-gateway
nhostcommercialCloud & SaaSaka nhost/auth, nhost cli

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

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 →

Timeline

Published
Mar 20, 2026
Last Updated
Jun 3, 2026

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