CVE-2026-34200

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
50(Track*)
EG Risk 50/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

March 31, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
github Patch Available🟡 PoC Available

Nhost CLI MCP Server: Missing Inbound Authentication on Explicitly Bound Network Port · Advisory · nhost/nhost · GitHub

https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2
github_pr Patch Available

fix(cli): remove possibility to bind mcp server to a port for security reasons

Patch available: nhost/nhost @nhost/[email protected] (PR #4060 merged 2026-03-26)

https://github.com/nhost/nhost/pull/4060
github_commit Patch Available

commit 15eae9285f9d (nhost/nhost)

Patch available: nhost/nhost @nhost/[email protected] (contains commit 15eae9285f9d)

https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 09:36 UTCEG score recompute
  4. 2026-07-25 14:18 UTCEPSS rescore
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  10. 2026-07-23 03:09 UTCEG score recompute
  11. 2026-07-22 14:08 UTCEPSS rescore
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  13. 2026-07-20 17:08 UTCEPSS rescore
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  17. 2026-07-17 04:54 UTCOSV refresh
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  1. 2026-07-11 08:27 UTCEPSS rescore
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  3. 2026-07-07 13:46 UTCEPSS rescore
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  10. 2026-07-01 15:06 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-29 03:02 UTCOSV refresh
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  23. 2026-06-22 14:25 UTCEPSS rescore
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  25. 2026-06-21 14:56 UTCEPSS rescore
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  27. 2026-06-21 01:59 UTCEPSS rescore
  28. 2026-06-19 19:25 UTCEPSS rescore
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  40. 2026-06-10 22:18 UTCEPSS rescore
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  44. 2026-06-07 15:25 UTCEPSS rescore
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  49. 2026-06-05 22:47 UTCEPSS rescore
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  51. 2026-06-05 06:10 UTCEPSS rescore
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  56. 2026-06-01 13:52 UTCEPSS rescore
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  59. 2026-06-01 05:13 UTCOSV refresh
  60. 2026-05-31 22:30 UTCEPSS rescore
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  62. 2026-05-31 00:16 UTCEPSS rescore
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  65. 2026-05-29 13:44 UTCEPSS rescore
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  73. 2026-05-26 13:44 UTCEPSS rescore
  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-34200?
CVE-2026-34200 is a high vulnerability published on March 31, 2026. 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…
When was CVE-2026-34200 disclosed?
CVE-2026-34200 was first published in the National Vulnerability Database on March 31, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34200 actively exploited?
CVE-2026-34200 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.3% of all scored CVEs.
What is the CVSS score of CVE-2026-34200?
CVE-2026-34200 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-34200?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34200, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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