CVE-2026-33221: Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload
Medium · CVSS 5.3 (CVSS 3.1)EPSS 0.18%, 7th percentilePublished Updated Assigner: GitHub_M
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N · CWE-343, CWE-345
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
nhost: nhost
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85 (opens in new tab)
- github.com/nhost/nhost/pull/4018 (opens in new tab)
- github.com/nhost/nhost/releases/tag/storage%400.12.0 (opens in new tab)
- github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffm (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)