CVE-2026-33221

Name: CVE-2026-33221
Creator: NVD / NIST
Published: 2026-03-20T23:16:46.163+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.1/10EPSS 0.17%

Last modified Jun 17, 2026

CVE-2026-33221 is a low-severity vulnerability rated 2.1/10 on the CVSS scale. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS 4.0

2.1/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.17%

7.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nhost	Storage	< 0.12.0

References

https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85Patch
https://github.com/nhost/nhost/pull/4018Issue Tracking, Patch
https://github.com/nhost/nhost/releases/tag/storage%400.12.0Product, Release Notes
https://github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffmMitigation, Vendor Advisory

Timeline

Published: Mar 20, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33221?

How severe is CVE-2026-33221?

CVE-2026-33221 has a CVSS score of 2.1/10 (LOW severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33221?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33221?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST