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CVE

CVE-2026-54052

n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
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CVE

CVE-2026-54052

n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

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 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
C
H
U
-

Related Resources

No items found.

References

https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54052.json, https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wx, https://nvd.nist.gov/vuln/detail/CVE-2026-54052

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00388%
EPSS Percentile
0.30962%
Introduced Version
0
Fix Available
ed0447d8a0a87ad45436ff5ee1af49a76667c965

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