{"schema":"threatline.record/2","record":{"id":"CVE-2026-110842","aliases":["GHSA-5jr4-xmvf-frmj"],"summary":"n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter","details":"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.","categories":["Frameworks"],"product":"n8n","vendor":"n8n-io","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-110842","source_modified_at":"2026-10-15T13:44:50.036Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"n8n","vendor":"n8n-io","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"2.41.4"},{"version":"2.42.0","status":"affected","versionType":"semver","lessThan":"2.42.1"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-110842","source_modified_at":"2026-10-15T13:44:50.036Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"n8n","ecosystem":null},"version":"2.41.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-110842","source_modified_at":"2026-10-15T13:44:50.036Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"n8n","ecosystem":null},"version":"2.42.1","basis":"first unaffected version stated in the CVE record"}],"cvss":7.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00312,"percentile":0.22924,"score_date":"2026-10-23"},"published_at":"2026-10-14T22:52:17.341Z","modified_at":"2026-10-15T13:44:50.036Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-110842","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T13:44:50.036Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-110842","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-5jr4-xmvf-frmj","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-via-mcp-workflow-validation-interpreter","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-15T13:44:32.171824Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-15T13:44:50.036Z","content_hash":"351e16df74b65fa27a33fc948f7b32c832a4f52109fe3977029a551f9eb018de"}}