{"id":"GHSA-p3rg-hrf9-w9gj","summary":"n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview","details":"## Impact\n\nThe HTML preview renders execution output into an `iframe srcdoc` without `sandbox`, so a sanitizer bypass lets injected script run same-origin as the editor. When a victim opens the preview, it can call authenticated APIs with their session. An account with `global:member` privileges can exploit it.\n\n## Patches\n\nThe issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\n\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Set the `N8N_CONTENT_SECURITY_POLICY` environment variable to a policy that blocks inline scripts.\n- Avoid exposing workflows that render externally-controlled input into the HTML node or binary HTML preview to untrusted users.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","aliases":["CVE-2026-65597"],"modified":"2026-07-22T19:03:13.869641Z","published":"2026-07-22T17:57:14Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-07-22T17:57:14Z","nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65597"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe"}],"affected":[{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.123.64"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-p3rg-hrf9-w9gj/GHSA-p3rg-hrf9-w9gj.json"}},{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.30.0"},{"fixed":"2.30.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-p3rg-hrf9-w9gj/GHSA-p3rg-hrf9-w9gj.json"}},{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0-rc.0"},{"fixed":"2.29.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-p3rg-hrf9-w9gj/GHSA-p3rg-hrf9-w9gj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N"}]}