GHSA-2cf7-hpwf-47h9

Source

https://github.com/advisories/GHSA-2cf7-hpwf-47h9

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-2cf7-hpwf-47h9/GHSA-2cf7-hpwf-47h9.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-2cf7-hpwf-47h9

Aliases

CVE-2026-55608

Published

2026-07-14T20:26:39Z

Modified

2026-07-14T20:30:19.654375247Z

Severity

4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

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

Details

Summary

In multi-tenant HTTP mode (ENABLE_MULTI_TENANT=true), an authenticated tenant could, under certain conditions, reach n8n-mcp's local default-scope workflow_versions backups instead of being confined to its own tenant scope. This affects n8n-mcp's own local workflow-version storage, not a normal n8n API capability.

Impact

An authenticated MCP HTTP tenant could read or delete workflow-version backups stored in the default (single-tenant) scope — for example backups left from a prior single-tenant deployment or a migration period. Workflow snapshots may contain sensitive workflow configuration depending on their contents. Single-tenant and stdio deployments are not affected.

Affected versions

<= 2.57.3

Patched version

2.57.4

Remediation

Upgrade to n8n-mcp 2.57.4 or later. The fix requires a complete tenant context in multi-tenant mode and fails closed for workflow-version access that cannot be attributed to a specific tenant.

Workarounds

Restrict network access to the HTTP endpoint (firewall / reverse proxy / VPN) so only trusted callers can reach it.
Run in stdio mode, which has no multi-tenant HTTP surface.
If default-scope backups from a prior single-tenant deployment are not needed, removing them eliminates the exposure.

Credit

Reported by @DavidCarliez.

Database specific

{
    "cwe_ids": [
        "CWE-200",
        "CWE-863"
    ],
    "severity": "MODERATE",
    "github_reviewed_at": "2026-07-14T20:26:39Z",
    "github_reviewed": true,
    "nvd_published_at": null
}

References

Affected packages

npm / n8n-mcp

Package

Name: n8n-mcp; View open source insights on deps.dev
Purl: pkg:npm/n8n-mcp

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.57.4

Database specific

last_known_affected_version_range

"<= 2.57.3"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-2cf7-hpwf-47h9/GHSA-2cf7-hpwf-47h9.json"