How severe is CVE-2026-34200?

CVE-2026-34200 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34200 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34200?

CVE-2026-34200 affects Nhost Cli. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34200?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34200 have an EU (EUVD) identifier?

Yes. CVE-2026-34200 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17452.

When was CVE-2026-34200 published?

CVE-2026-34200 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34200

CVE-2026-34200 is a high-severity vulnerability in Nhost Cli with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.7
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17452
Weakness: CWE-306
Affected product: Nhost Cli
Published: 2026-03-31
Last modified: 2026-06-17

Description

Nhost is an open source Firebase alternative with GraphQL. Prior to version 1.41.0, The Nhost CLI MCP server, when explicitly configured to listen on a network port, applies no inbound authentication and does not enforce strict CORS. This allows a malicious website visited on the same machine to issue cross-origin requests to the MCP server and invoke privileged tools using the developer's locally configured credentials. This vulnerability requires two explicit, non-default configuration steps to be exploitable. The default nhost mcp start configuration is not affected. This issue has been patched in version 1.41.0.

Frequently asked questions

What is CVE-2026-34200?: Nhost is an open source Firebase alternative with GraphQL. Prior to version 1.41.0, The Nhost CLI MCP server, when explicitly configured to listen on a network port, applies no inbound authentication and does not enforce strict CORS. This allows a malicious website visited on the same machine to issue cross-origin requests to the MCP server and invoke privileged tools using the developer's locally configured credentials. This vulnerability requires two explicit, non-default configuration steps to be exploitable. The default nhost mcp start configuration is not affected. This issue has been patched in version 1.41.0.
How severe is CVE-2026-34200?: CVE-2026-34200 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34200 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34200?: CVE-2026-34200 affects Nhost Cli. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34200?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34200 have an EU (EUVD) identifier?: Yes. CVE-2026-34200 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17452.
When was CVE-2026-34200 published?: CVE-2026-34200 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nhost:cli:*:*:*:*:*:*:*:*

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