{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/70016?format=json","vulnerability_id":"VCID-pfg8-u5dk-13g1","summary":"n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2.","aliases":[{"alias":"CVE-2026-45707"},{"alias":"GHSA-jxx9-px88-pj69"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/40954?format=json","purl":"pkg:npm/n8n-mcp@2.51.2","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/n8n-mcp@2.51.2"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/40953?format=json","purl":"pkg:npm/n8n-mcp@2.51.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-pfg8-u5dk-13g1"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/n8n-mcp@2.51.1"}],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45707","reference_id":"","reference_type":"","scores":[{"value":"0.00033","scoring_system":"epss","scoring_elements":"0.10241","published_at":"2026-06-14T12:55:00Z"},{"value":"0.00033","scoring_system":"epss","scoring_elements":"0.10255","published_at":"2026-06-13T12:55:00Z"},{"value":"0.00033","scoring_system":"epss","scoring_elements":"0.10249","published_at":"2026-06-12T12:55:00Z"},{"value":"0.00033","scoring_system":"epss","scoring_elements":"0.102","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45707"},{"reference_url":"https://github.com/czlonkowski/n8n-mcp","reference_id":"","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/czlonkowski/n8n-mcp"},{"reference_url":"https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab","reference_id":"853015d0897be7cf2d9d4726de195c938e4395ab","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-06-01T19:05:28Z/"}],"url":"https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45707","reference_id":"CVE-2026-45707","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45707"},{"reference_url":"https://github.com/advisories/GHSA-jxx9-px88-pj69","reference_id":"GHSA-jxx9-px88-pj69","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-jxx9-px88-pj69"},{"reference_url":"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69","reference_id":"GHSA-jxx9-px88-pj69","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-06-01T19:05:28Z/"}],"url":"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69"},{"reference_url":"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2","reference_id":"v2.51.2","reference_type":"","scores":[{"value":"8.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-06-01T19:05:28Z/"}],"url":"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2"}],"weaknesses":[{"cwe_id":284,"name":"Improper Access Control","description":"The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor."}],"exploits":[],"severity_range_score":"7.0 - 8.9","exploitability":"0.5","weighted_severity":"8.0","risk_score":4.0,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-pfg8-u5dk-13g1"}