CVE-2026-42282

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% 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
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0

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

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. In deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of: bearer tokens and OAuth credentials sent through n8n_manage_credentials, per-tenant API keys and webhook auth headers embedded in tool arguments, arbitrary secret-bearing payloads passed to any MCP tool. The issue requires authentication (AUTH_TOKEN accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. This issue has been patched in version 2.47.13.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
—
EPSS
16.5%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 14, 2026

Advisory Details (3)

Auto-updated Jun 16, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode · Advisory · czlonkowski/n8n-mcp · GitHub

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-wg4g-395p-mqv3
github_release Patch Available

Release v2.47.13

Patch available: czlonkowski/n8n-mcp v2.47.13

https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.13
github_commit Patch Available

commit 59b665bda367 (czlonkowski/n8n-mcp)

Patch available: czlonkowski/n8n-mcp v2.47.13 (contains commit 59b665bda367)

https://github.com/czlonkowski/n8n-mcp/commit/59b665bda36797823df238aeaf20adb862c9f451

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
n8n-mcp—2.47.13—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  58. 2026-05-20 13:32 UTCEG score recompute
  59. 2026-05-20 11:22 UTCEPSS rescore
  60. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42282?
CVE-2026-42282 is a medium vulnerability published on May 8, 2026. n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the…
When was CVE-2026-42282 disclosed?
CVE-2026-42282 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42282 actively exploited?
CVE-2026-42282 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42282?
CVE-2026-42282 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-42282?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42282, 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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