{"id":"GHSA-2cf7-hpwf-47h9","revision":"07a2c5ce14ed40e08bf8e3ec90246f66","records":[{"revision":"07a2c5ce14ed40e08bf8e3ec90246f66","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-2cf7-hpwf-47h9","aliases":["CVE-2026-55608"],"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`<= 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.","state":0,"publishedAt":"2026-07-14T20:26:39+00:00","modifiedAt":"2026-07-14T20:41:39.631777+00:00","affected":[{"ecosystem":"npm","name":"n8n-mcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.57.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9","https://github.com/czlonkowski/n8n-mcp/commit/c1ca1e73697feaec5ec2a5fb7e6992a2892b62c9","https://github.com/czlonkowski/n8n-mcp","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4"],"sourceUrl":"https://github.com/advisories/GHSA-2cf7-hpwf-47h9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2cf7-hpwf-47h9","identifiers":["GHSA-2cf7-hpwf-47h9","CVE-2026-55608"]},"retained":false,"historicalAffected":[]}],"coverage":[]}