# CVE-2026-33221

## Summary

- **CVE ID:** CVE-2026-33221
- **Severity:** LOW
- **CVSS Score:** 2.1 (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)
- **CWE:** CWE-345, CWE-343
- **Published:** Mar 20, 2026
- **Last Modified:** Mar 25, 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.

## Affected Products

- nhost — nhost (< 0.12.0)

## References

- [CNA](https://github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffm)
- [CNA](https://github.com/nhost/nhost/pull/4018)
- [CNA](https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85)
- [CNA](https://github.com/nhost/nhost/releases/tag/storage%400.12.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._