{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33749", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-23T18:30:14.124Z", "datePublished": "2026-03-25T18:39:54.762Z", "dateUpdated": "2026-03-25T20:07:12.197Z"}, "containers": {"cna": {"title": "n8n Vulnerable to XSS via Binary Data Inline HTML Rendering", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "baseScore": 6.3, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H", "version": "4.0"}}], "references": [{"name": "https://github.com/n8n-io/n8n/security/advisories/GHSA-qfc3-hm4j-7q77", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-qfc3-hm4j-7q77"}], "affected": [{"vendor": "n8n-io", "product": "n8n", "versions": [{"version": "< 1.123.27", "status": "affected"}, {"version": ">= 2.0.0-rc.0, < 2.13.3", "status": "affected"}, {"version": "= 2.14.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-25T18:39:54.762Z"}, "descriptions": [{"lang": "en", "value": "n8n is an open source workflow automation platform. Prior to versions 1.123.27, 2.13.3, and 2.14.1, an authenticated user with permission to create or modify workflows could craft a workflow that produces an HTML binary data object without a filename. The `/rest/binary-data` endpoint served such responses inline on the n8n origin without `Content-Disposition` or `Content-Security-Policy` headers, allowing the HTML to render in the browser with full same-origin JavaScript access. By sending the resulting URL to a higher-privileged user, an attacker could execute JavaScript in the victim's authenticated session, enabling exfiltration of workflows and credentials, modification of workflows, or privilege escalation to admin. The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, and/or restrict network access to the n8n instance to prevent untrusted users from accessing binary data URLs. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures."}], "source": {"advisory": "GHSA-qfc3-hm4j-7q77", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-25T20:07:00.586065Z", "id": "CVE-2026-33749", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-25T20:07:12.197Z"}}]}}

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{}

{"analysis": {"en": {"generated_at": "2026-03-25T20:21:24.022567+00:00", "value": {"mitigation_remediation": ["Upgrade n8n to version 1.123.27, 2.13.3, or 2.14.1 or newer.", "Limit the creation and editing of workflows to fully trusted users only.", "Restrict network access to the n8n instance so that untrusted users cannot retrieve binary data URLs."], "summary": {"action": "Immediate Patch", "impact": "Cross\u2011Site Scripting with potential credential theft and privilege escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects n8n-io\u2019s n8n platform for all versions earlier than 1.123.27, 2.13.3, and 2.14.1. Users running these versions should be alerted that any authenticated user with workflow creation or modification rights may craft malicious workflows that render inline HTML on the platform\u2019s binary\u2011data endpoint.", "description_and_impact": "An attacker who can create or edit workflows in n8n can author a workflow that generates an HTML binary data object without a filename. The binary-data endpoint serves this content inline on the n8n origin, omitting both Content\u2011Disposition and Content\u2011Security\u2011Policy headers, allowing the HTML to render in the browser with full same\u2011origin JavaScript access. As a result, the attacker can inject arbitrary JavaScript that runs in the victim\u2019s authenticated session, enabling exfiltration of sensitive data, modification of workflows, or escalation to administrative privileges.", "risk_and_exploitability": "The CVSS score of 6.3 indicates a moderate severity, and the vulnerability is not listed in the CISA KEV catalog, but it can be exploited by authenticated users with privilege to edit workflows. The attacker must first create a malicious workflow and then lure a higher\u2011privileged user to visit the resulting URL, which is a type of user\u2011interaction requirement. Although not readily exploitable by casual attackers, the impact to privileged internal accounts makes the risk significant for organizations that allow broad workflow editing rights."}}}}, "created": "2026-03-25T21:46:28.066482+00:00", "updated": "2026-03-25T21:46:28.066513+00:00", "vendors": []}