CVE-2026-54309

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% 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
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 10.0Exploit: NoneExposed: 0

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

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP transport mode, the MCP endpoint accepts session initialization and tool invocation requests without any authentication. Any network-reachable client, or any website visited by the user, can establish an MCP session and invoke browser-control tools. Where the n8n AI Browser Bridge extension is installed and a browser connection is active, an unauthenticated caller can access browser-control capabilities including navigation, JavaScript evaluation, and cookie and storage access against the user's real browser profile. This issue only affects instances where @n8n/mcp-browser is run with the HTTP transport (--transport http). This vulnerability is fixed in 2.25.7 and 2.26.2.

CVSS v3
10.0
EG Score
10.0(medium)
EPSS
32.3%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jul 3, 2026
Patch available. Sources: github.
github Patch Available

n8n MCP Browser HTTP Transport Exposes Unauthenticated Browser-Control Sessions · Advisory · n8n-io/n8n · GitHub

https://github.com/n8n-io/n8n/security/advisories/GHSA-qrx8-25qr-5r7v

Vendor Advisories for CVE-2026-54309(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
n8n—2.25.7—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 44× in last 7d / 126× 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 126 total refreshes for this CVE.

  1. 2026-07-07 09:58 UTCEG score recompute
  2. 2026-07-07 02:49 UTCEG score recompute
  3. 2026-07-06 22:56 UTCEG score recompute
  4. 2026-07-06 16:27 UTCEPSS rescore
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  1. 2026-07-03 02:48 UTCEG score recompute
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  50. 2026-06-26 11:49 UTCEG score recompute▲ 1.20
  51. 2026-06-25 19:49 UTCNVD updateCVSS v3 → 10 · severity → CRITICAL
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  58. 2026-06-23 19:16 UTCEG score recompute▼ 1.20
  59. 2026-06-23 15:45 UTCMITRE cvelistV5CVSS v3 → 8.8 · CVSS v4 → 8.8
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54309?
CVE-2026-54309 is a critical vulnerability published on June 16, 2026. n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP transport mode, the MCP endpoint accepts session initialization and tool invocation requests without any authentication. Any network-reachable client, or any website visited by the…
When was CVE-2026-54309 disclosed?
CVE-2026-54309 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54309 actively exploited?
CVE-2026-54309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54309?
CVE-2026-54309 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-54309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54309, 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.

Dependency Blast Radius

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