CVE-2026-65597

highCVSS 5.4covered by 2 sourcesfirst seen 2026-07-22

Impact The 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. Patches The 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. Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n instance access to fully trusted users only. - Set the N8N_CONTENT_SECURITY_POLICY environment variable to a policy that blocks inline scripts. - Avoid exposing workflows that render externally-controlled input into the HTML node or binary HTML preview to untrusted users. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.

Advisory coverage (2)

highGHSA-p3rg-hrf9-w9gj: n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Previewghsa · 2026-07-22
mediumCVE-2026-65597: n8n before 1.123.64, 2.x before 2.29.8, and before 2.30.1 contains a DOM-based cross-site scri…nvd · 2026-07-22

External references

NVD record for CVE-2026-65597

CVE.org record

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