{"id":"CVE-2026-42230","state":"PUBLISHED","title":"n8n: Open Redirect in MCP OAuth Consent Flow","description":"n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /mcp-oauth/register endpoint accepted OAuth client registrations without authentication, allowing arbitrary redirect_uri values to be registered. When a user denies the MCP OAuth consent dialog, the handleDeny handler redirects the user to the registered redirect_uri without validation, enabling an open redirect to an attacker-controlled URL. An attacker can craft a phishing link and send it to a victim; if the victim clicks \"Deny\" on the consent page, they are silently redirected to an external site. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.","publishedAt":"2026-05-04T18:28:43.069Z","updatedAt":"2026-05-04T19:56:27.611Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["n8n-io n8n"],"affected":[{"vendor":"n8n-io","product":"n8n","versions":[{"version":"< 1.123.32","status":"affected"},{"version":">= 2.17.0, < 2.17.4","status":"affected"},{"version":">= 2.18.0, < 2.18.1","status":"affected"}]}],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9"],"weaknesses":["CWE-601"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42230.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42230","state":"PUBLISHED","datePublished":"2026-05-04T18:28:43.069Z","dateUpdated":"2026-05-04T19:56:27.611Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-25T05:37:12.117Z"},"containers":{"cna":{"title":"n8n: Open Redirect in MCP OAuth Consent Flow","descriptions":[{"lang":"en","value":"n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /mcp-oauth/register endpoint accepted OAuth client registrations without authentication, allowing arbitrary redirect_uri values to be registered. When a user denies the MCP OAuth consent dialog, the handleDeny handler redirects the user to the registered redirect_uri without validation, enabling an open redirect to an attacker-controlled URL. An attacker can craft a phishing link and send it to a victim; if the victim clicks \"Deny\" on the consent page, they are silently redirected to an external site. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1."}],"affected":[{"vendor":"n8n-io","product":"n8n","versions":[{"version":"< 1.123.32","status":"affected"},{"version":">= 2.17.0, < 2.17.4","status":"affected"},{"version":">= 2.18.0, < 2.18.1","status":"affected"}]}],"references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9","name":"https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-601","lang":"en","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-04T18:28:43.069Z"},"source":{"advisory":"GHSA-f6x8-65q6-j9m9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-04T19:55:49.415422Z","id":"CVE-2026-42230","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-04T19:56:27.611Z"}}]}}}