{"id":"EUVD-2026-20968","revision":null,"records":[{"revision":"455cc98acb464302b0a1234440fb0d54","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-39974","aliases":[],"title":"n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode","description":"n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTH_TOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to. The primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid AUTH_TOKEN, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected. This vulnerability is fixed in 2.47.4.","state":0,"publishedAt":"2026-04-09T16:45:20.49+00:00","modifiedAt":"2026-04-13T20:09:26.781+00:00","affected":[{"ecosystem":"Vendor product","name":"n8n-mcp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"czlonkowski\",\n                    \"product\": \"n8n-mcp\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.47.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","score":8.5,"severity":"HIGH"}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr","https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-39974","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-39974","identifiers":["CVE-2026-39974"]},"retained":false,"historicalAffected":[]},{"revision":"2f1626108c444445987454226ef3b948","observedAt":"2026-10-28T05:00:32.343+00:00","statement":{"source":"euvd","id":"EUVD-2026-20968","aliases":["CVE-2026-39974"],"title":"n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a …","description":"n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTH_TOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to. The primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid AUTH_TOKEN, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected. This vulnerability is fixed in 2.47.4.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","score":8.5,"severity":null}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr","https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-20968","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 9, 2026, 4:45:20 PM","dateUpdated":"Apr 13, 2026, 8:09:26 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-20968","identifiers":["EUVD-2026-20968","CVE-2026-39974"]},"retained":false,"historicalAffected":[]},{"revision":"d3bf137cad464ee88b5f7504e5d76445","observedAt":"2026-10-27T10:09:56.341+00:00","statement":{"source":"nvd","id":"CVE-2026-39974","aliases":[],"title":"n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a …","description":"n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTH_TOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to. The primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid AUTH_TOKEN, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected. This vulnerability is fixed in 2.47.4.","state":0,"publishedAt":"2026-04-09T17:16:30.933+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","score":8.5,"severity":"HIGH"}],"references":["https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4","https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-39974","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-918"],"productCriteria":["cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-09T17:16:30.933","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-39974","identifiers":["CVE-2026-39974"]},"retained":false,"historicalAffected":[]},{"revision":"af6ad9983fd54a6188b41d49490cc13f","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-4ggg-h7ph-26qr","aliases":["CVE-2026-39974"],"title":"n8n-mcp has authenticated SSRF via instance-URL header in multi-tenant HTTP mode","description":"## Impact\nAn authenticated Server-Side Request Forgery in `n8n-mcp` allows a caller holding a valid `AUTH_TOKEN` to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the contents of any URL the server can reach — including cloud instance metadata endpoints (AWS IMDS, GCP, Azure, Alibaba, Oracle), internal network services, and any other host the server process has network access to.\n\nThe primary at-risk deployments are multi-tenant HTTP installations where more than one operator can present a valid `AUTH_TOKEN`, or where a token is shared with less-trusted clients. Single-tenant stdio deployments and HTTP deployments without multi-tenant headers are not affected.\n\n## Affected versions\n`n8n-mcp` ≤ `2.47.3` (all versions up to and including 2.47.3).\n\n## Patched versions\n`n8n-mcp` `2.47.4` and later.\n\n## Workarounds\nIf you cannot immediately upgrade:\n1. **Egress filtering at the network layer** — block outbound traffic from the `n8n-mcp` container to RFC1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), link-local `169.254.0.0/16`, and any other internal ranges. This defends against any future SSRF-class issue and is recommended even after upgrading.\n2. **Disable multi-tenant headers** — if your deployment does not require per-request instance switching, unset `ENABLE_MULTI_TENANT` and do not accept `x-n8n-url` / `x-n8n-key` headers at the reverse proxy.\n3. **Restrict `AUTH_TOKEN` distribution** — ensure the bearer token is only held by fully trusted operators until you can upgrade.\n\n## Remediation\nUpgrade to `n8n-mcp` 2.47.4 or later. No configuration changes are required; the fix adds validation at the URL entry points and normalizes URLs at the API client layer.\n\n## Credits\nReported by the Eresus Security Research Team. @ibrahmsql","state":0,"publishedAt":"2026-04-08T19:53:48+00:00","modifiedAt":"2026-04-09T19:16:17.275218+00:00","affected":[{"ecosystem":"npm","name":"n8n-mcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.47.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr","https://nvd.nist.gov/vuln/detail/CVE-2026-39974","https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096","https://github.com/czlonkowski/n8n-mcp","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4"],"sourceUrl":"https://github.com/advisories/GHSA-4ggg-h7ph-26qr","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4ggg-h7ph-26qr","identifiers":["GHSA-4ggg-h7ph-26qr","CVE-2026-39974"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-30T01:48:55.4491357+00:00","complete":true,"records":1764,"lastAttemptAt":"2026-10-30T01:48:55.4491357+00:00","lastSuccessAt":"2026-10-30T01:48:55.6546169+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.6546176+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7e2c4e7288f2c464ad8c61f3bb6017374714faedcc781283ac06a706ee1a820b-8739c76e681f900923b900c9df0ef75cf421d39cabb54650c4b9ad19b6a76d85","complete":true,"records":416807,"lastAttemptAt":"2026-10-30T01:48:54.7743429+00:00","lastSuccessAt":"2026-10-30T00:54:38.6858592+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:54.7743429+00:00","snapshotPublishedAt":"2026-10-30T01:29:33+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-824f5092797940c08129032fcab8f0dd","complete":false,"records":13504,"lastAttemptAt":"2026-10-30T02:01:05.0861472+00:00","lastSuccessAt":"2026-10-30T02:01:05.08+00:00","error":"9 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-10-30T02:01:05.08+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13547,"expectedIdentifiers":13587,"failedIdentifiers":9},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-30T01:48:55.4491357+00:00","complete":true,"records":1094,"lastAttemptAt":"2026-10-30T01:48:55.4491357+00:00","lastSuccessAt":"2026-10-30T01:48:55.6554576+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.6554578+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c39f89b50d5243318487ad216daf7ffb","complete":true,"records":13527,"lastAttemptAt":"2026-10-30T01:48:56.2261206+00:00","lastSuccessAt":"2026-10-29T22:50:37.74+00:00","error":null,"lastVerifiedAt":"2026-10-29T22:50:37.74+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13587,"expectedIdentifiers":13587,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-9016081e9e88f5929902343d85df87c5c4a1486b10ab07bc6c4f53f98f358871","complete":true,"records":9806,"lastAttemptAt":"2026-10-30T01:48:55.2317852+00:00","lastSuccessAt":"2026-10-29T17:17:25.9359141+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.2317852+00:00","snapshotPublishedAt":"2026-10-29T16:48:29+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-10-30T01:48:54.9356382+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:54.9356382+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-5221f6b645588be0464ab0e16e8adfe42d1ccd8f841048d2bd4d0c1cf79fd6b1","complete":true,"records":3014,"lastAttemptAt":"2026-10-30T01:48:55.4168216+00:00","lastSuccessAt":"2026-10-30T00:54:54.6624163+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.4168216+00:00","snapshotPublishedAt":"2026-10-30T00:48:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-ec5b13e78c39945726a720832da7660d2774969f16e2a34f99460c135811abd5","complete":true,"records":230948,"lastAttemptAt":"2026-10-30T01:48:55.0481567+00:00","lastSuccessAt":"2026-10-29T22:50:35.0693267+00:00","error":null,"lastVerifiedAt":"2026-10-30T01:48:55.0481567+00:00","snapshotPublishedAt":"2026-10-29T22:33:13+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}