CVE-2026-33221

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

State: Published
Severity: 2.1 Low
Published: Mar 20, 2026
Updated: Mar 25, 2026
Reserved: Mar 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	2.1 Low	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	GitHub_M

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity
CWE-343 Predictable Value Range from Previous Values

Affected Products

Product	Versions
nhostnhost	< 0.12.0Affected

References

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