{"id":"EUVD-2026-47638","enisaUuid":"fa5be6de-8c28-338a-975c-02b7c726e1ca","description":"n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user\u0027s workflow, and obtain a valid token. The workflow then runs in the owner\u0027s project context with the owner\u0027s stored credentials, and the attacker can set tool inputs and read outputs (potentially including data from the owner\u0027s connected integrations), breaking user and project isolation.","datePublished":"Jul 22, 2026, 11:21:42 AM","dateUpdated":"Oct 29, 2026, 9:16:24 PM","baseScore":5.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N","references":"https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf\nhttps://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check\n","aliases":"CVE-2026-65594\nGHSA-5vfw-jc4p-fj39\nGHSA-q5xf-xhwf-cwqf\n","assigner":"VulnCheck","epss":0.44,"enisaIdProduct":[{"id":"74c9a421-b9f9-354e-b127-a79b856a5b2e","product":{"name":"n8n","vendor":{"name":"n8n-io"}},"product_version":"0 \u003c2.29.8"},{"id":"99c2d53b-b47e-3aee-93bb-750d8b102e66","product":{"name":"n8n","vendor":{"name":"n8n-io"}},"product_version":"2.30.0 \u003c2.30.1"}],"enisaIdVendor":[{"id":"fbeded1f-bb84-36fd-954d-df5fc80f03a6","vendor":{"name":"n8n-io"}}],"enisaIdVulnerability":[{"id":"9c079e67-c218-3ea6-af0c-9e5383470e58","vulnerability":{"id":"CVE-2026-65594","description":"n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user\u0027s workflow, and obtain a valid token. The workflow then runs in the owner\u0027s project context with the owner\u0027s stored credentials, and the attacker can set tool inputs and read outputs (potentially including data from the owner\u0027s connected integrations), breaking user and project isolation.","datePublished":"Jul 22, 2026, 11:21:42 AM","dateUpdated":"Oct 29, 2026, 9:16:24 PM","status":"PUBLISHED","baseScore":5.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N","references":"https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf\nhttps://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check\n","enisa_id":"EUVD-2026-47638\n","assigner":"VulnCheck","epss":0.44,"dataProcessed":"Nov 1, 2026, 7:17:00 AM","vulnerabilityProduct":[{"id":"02d87767-1f56-372b-89a1-a2cf8163af5d","product":{"name":"n8n","vendor":{"name":"n8n-io"}},"product_version":"0 \u003c2.29.8"},{"id":"e87a6980-63e9-31dd-aa7b-061d1323e657","product":{"name":"n8n","vendor":{"name":"n8n-io"}},"product_version":"2.30.0 \u003c2.30.1"}],"vulnerabilityVendor":[{"id":"d5742837-0aa6-3ea6-8b31-48bb3ccc82c7","vendor":{"name":"n8n-io"}}]}},{"id":"c1d2380b-66e3-36cf-9221-d32da234ae98","vulnerability":{"id":"GHSA-5vfw-jc4p-fj39","description":"Duplicate Advisory: Member-Level Users Can Execute Other Users\u0027 MCP Server Trigger Workflows via Missing OAuth Authorization Check","datePublished":"Jul 22, 2026, 12:32:17 PM","dateUpdated":"Jul 22, 2026, 10:30:28 PM","baseScore":0.0,"references":"https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-65594\nhttps://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check\n","enisa_id":"EUVD-2026-47638\n","aliases":"GHSA-5vfw-jc4p-fj39\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:03:08 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"c38ca089-5a25-39bf-9af1-bb1ac5c59e4a","vulnerability":{"id":"GHSA-q5xf-xhwf-cwqf","description":"n8n: Member-Level Users Can Execute Other Users\u0027 MCP Server Trigger Workflows via Missing OAuth Authorization Check","datePublished":"Jul 22, 2026, 10:31:01 PM","dateUpdated":"Jul 22, 2026, 10:31:01 PM","baseScore":0.0,"references":"https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-65594\nhttps://github.com/n8n-io/n8n\nhttps://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8\nhttps://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1\nhttps://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check\n","enisa_id":"EUVD-2026-47638\n","aliases":"CVE-2026-65594\nGHSA-q5xf-xhwf-cwqf\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:03:08 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}