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n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

cve-program · CVE-2026-55608

Published

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.

Source published
15 Jul 2026 20:35:29 UTC
Source modified
17 Jul 2026 12:32:25 UTC
Observed here
23 Oct 2026 15:48:27 UTC
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CVSS 3.1 · 4.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

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Sources last checked 27 Oct 09:03 UTC · 269 of 272 readable · 268 fully read · checking again after a restart · documentation 469/469 current