{"id":"CVE-2026-110842","revision":"be2baa3bbad343958bfd86eaba145718","records":[{"revision":"be2baa3bbad343958bfd86eaba145718","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-110842","aliases":[],"title":"n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter","description":"n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the MCP workflow-validation tool, whose interpreter evaluates caller-supplied code in the main process, reads inherited properties, and permits assignment onto shared prototypes. An authenticated member holding only a workflow:read grant can replace a built-in method with one returning a truthy value so server-side permission checks accept unheld scopes, enabling takeover of owner accounts not protected by MFA.","state":0,"publishedAt":"2026-10-14T22:52:17.341+00:00","modifiedAt":"2026-10-15T13:44:50.036+00:00","affected":[{"ecosystem":"Vendor product","name":"n8n","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"n8n-io\",\n                    \"product\": \"n8n\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/n8n\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.41.4\"\n                        },\n                        {\n                            \"version\": \"2.42.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.42.1\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":7.7,"severity":"HIGH"}],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-5jr4-xmvf-frmj","https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-via-mcp-workflow-validation-interpreter"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110842","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-110842","identifiers":["CVE-2026-110842"]},"retained":false,"historicalAffected":[]}],"coverage":[]}