{"id":"CVE-2026-56356","aliases":["GHSA-3c7f-5hgj-h279"],"url":"https://o3.security/vulnerability/CVE-2026-56356","summary":"n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field","details":"## Impact\nAn authenticated user with permission to create or modify workflows could inject malicious JavaScript into the Custom CSS field of the Chat Trigger node. Due to a misconfiguration in the `sanitize-html` library, the sanitization could be bypassed, resulting in stored XSS on the public chat page. Any user visiting the chat URL would be affected.\n\n## Patches\nThe 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.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Disable the Chat Trigger node by adding `@n8n/n8n-nodes-langchain.chatTrigger` to the `NODES_EXCLUDE` environment variable.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","published":"2026-06-30T22:08:35.484Z","modified":"2026-08-12T03:51:16.180441607Z","cvss":null,"epss":{"score":0.0025,"percentile":0.16611,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"n8n","fixedVersion":"1.123.27"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.14.1"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.13.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56356.json"},{"type":"ADVISORY","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56356"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:16.180441607Z"}}