n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
CVE-2026-54052
CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 69% 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
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.9
- EG Score
- 9.9(medium)
- EG Risk
- —
- EPSS
- 31.4%
- KEV
- Not listed
Published
July 14, 2026
Last Modified
July 18, 2026
Advisory Details (2)
Auto-updated Jul 18, 2026Patch available. Sources: github_release, github.
github Patch Available
Cross-tenant access to workflow version backups in multi-tenant HTTP deployments · Advisory · czlonkowski/n8n-mcp · GitHub
https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wxgithub_release Patch Available
Release v2.56.1
Patch available: czlonkowski/n8n-mcp v2.56.1
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1Vendor Advisories for CVE-2026-54052(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)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| n8n-mcp | — | 2.56.1 | — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 8× 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.
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 02:40 UTCEG score recompute
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-18 10:04 UTCEPSS rescore
- 2026-07-16 17:03 UTCEPSS rescore
- 2026-07-14 19:10 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-862 · CWE-639
Frequently asked(5)
What is CVE-2026-54052?
CVE-2026-54052 is a critical vulnerability published on July 14, 2026. n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLEMULTITENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an…
When was CVE-2026-54052 disclosed?
CVE-2026-54052 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54052 actively exploited?
CVE-2026-54052 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54052?
CVE-2026-54052 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-54052?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54052, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54052
Is Your Infrastructure Affected by CVE-2026-54052?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.