{"id":"CVE-2026-55608","aliases":["EUVD-2026-44807","GHSA-2cf7-hpwf-47h9"],"status":"published","title":"n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode","description":"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.","severity":{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0028,"percentile":0.20716,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200","CWE-863"],"published":"2026-07-14T20:26:39Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"n8n-mcp","fixed_in":["2.57.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"n8n-mcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.57.3"},{"fixed":"2.57.4"}]}]},{"source":"osv","ecosystem":"npm","package":"n8n-mcp","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.57.4"}]}]}],"products":[{"vendor":"czlonkowski","product":"n8n-mcp"},{"vendor":"n8n-mcp","product":"n8n-mcp"}],"references":[{"url":"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/czlonkowski/n8n-mcp/commit/c1ca1e73697feaec5ec2a5fb7e6992a2892b62c9","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2cf7-hpwf-47h9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55608.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55608","tags":["advisory"]},{"url":"https://github.com/czlonkowski/n8n-mcp","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-55608","title":"n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode","description":"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.","status":"published","published":"2026-07-15T20:35:29.539Z","modified":"2026-07-17T12:32:25.385Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-44807","description":"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.","status":"published","published":"2026-07-15T20:35:29Z","modified":"2026-07-17T12:32:25Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:19:50.846094Z"}],"ghsa":[{"id":"GHSA-2cf7-hpwf-47h9","title":"n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode","description":"## Summary\n\nIn 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.\n\n## Impact\n\nAn 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.\n\n## Affected versions\n\n`\u003c= 2.57.3`\n\n## Patched version\n\n`2.57.4`\n\n## Remediation\n\nUpgrade 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.\n\n## Workarounds\n\n- Restrict network access to the HTTP endpoint (firewall / reverse proxy / VPN) so only trusted callers can reach it.\n- Run in stdio mode, which has no multi-tenant HTTP surface.\n- If default-scope backups from a prior single-tenant deployment are not needed, removing them eliminates the exposure.\n\n## Credit\n\nReported by @DavidCarliez.","status":"published","published":"2026-07-14T20:26:39Z","modified":"2026-07-14T20:26:41Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T14:40:43.958448Z"}],"nvd":[{"id":"CVE-2026-55608","description":"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.","status":"published","published":"2026-07-15T21:16:55.307Z","modified":"2026-10-24T21:10:00.13Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T14:12:30.250437Z"}],"osv":[{"id":"CVE-2026-55608","title":"n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode","description":"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.","status":"published","published":"2026-07-15T20:35:29.539Z","modified":"2026-10-28T02:30:49.500164338Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T15:45:11.22012Z"},{"id":"GHSA-2cf7-hpwf-47h9","title":"n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode","description":"## Summary\n\nIn 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.\n\n## Impact\n\nAn 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.\n\n## Affected versions\n\n`\u003c= 2.57.3`\n\n## Patched version\n\n`2.57.4`\n\n## Remediation\n\nUpgrade 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.\n\n## Workarounds\n\n- Restrict network access to the HTTP endpoint (firewall / reverse proxy / VPN) so only trusted callers can reach it.\n- Run in stdio mode, which has no multi-tenant HTTP surface.\n- If default-scope backups from a prior single-tenant deployment are not needed, removing them eliminates the exposure.\n\n## Credit\n\nReported by @DavidCarliez.","status":"published","published":"2026-07-14T20:26:39Z","modified":"2026-07-14T20:41:39.631777Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-200","CWE-863"],"updated_at":"2026-11-02T15:46:34.338541Z"}]}}