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

Quick assessment

Affected
nhost nhost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nhost是Nhost开源的一个后端即服务平台。 Nhost 0.12.0之前版本存在数据伪造问题漏洞，该漏洞源于存储服务的文件上传处理程序信任客户端提供的Content-Type标头而未进行服务器端MIME类型检测，可能导致攻击者上传任意MIME类型的文件，绕过存储桶的MIME类型限制。

AI Predicted 6.5 Difficulty: Easy EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1561 · Disk Wipe
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I. Basic Information for CVE-2026-33221

Vulnerability Information
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Vulnerability Title
Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Nhost 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nhost是Nhost开源的一个后端即服务平台。 Nhost 0.12.0之前版本存在数据伪造问题漏洞，该漏洞源于存储服务的文件上传处理程序信任客户端提供的Content-Type标头而未进行服务器端MIME类型检测，可能导致攻击者上传任意MIME类型的文件，绕过存储桶的MIME类型限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nhost nhost < 0.12.0 -

II. Public POCs for CVE-2026-33221

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III. Intelligence Information for CVE-2026-33221

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Patches & Fixes for CVE-2026-33221 (2)

Vendor Advisories for CVE-2026-33221 (1)

Vendor Pages for CVE-2026-33221 (1)

IV. Related Vulnerabilities

Same product: nhost
Same vendor: nhost
Same weakness: CWE-345

V. Comments for CVE-2026-33221

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