CVE-2026-33221

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-03-20 23:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:37 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 2.1 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-03-20 23:16 UTC

Last modified

2026-06-17 10:37 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-343

Record status

Analyzed

Affected

• Nhost Storage < 0.12.0

Attack profile CVSS 4.0 · 2.1

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

Active

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-33221.md and follow it. Check whether this project is affected by CVE-2026-33221. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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