n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview
HighCVE-2026-65597 · Published Jul 22, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| n8n npm | < 1.123.64 | 1.123.64 |
| >= 2.30.0, < 2.30.1 | 2.30.1 | |
| >= 2.0.0-rc.0, < 2.29.8 | 2.29.8 |
Details and references
## 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.
- CVSS 4.0
- 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
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-79
- Also known as
- CVE-2026-65597
- github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj
- nvd.nist.gov/vuln/detail/CVE-2026-65597
- github.com/n8n-io/n8n
- github.com/n8n-io/n8n/releases/tag/n8n@1.123.64
- github.com/n8n-io/n8n/releases/tag/n8n@2.29.8
- github.com/n8n-io/n8n/releases/tag/n8n@2.30.1
- www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe
More n8n advisories
All n8n| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 22 | n8n: AI Agents Project Viewer Privilege Escalation via run_node_tool CVE-2026-65015Highfixed in 2.29.8, 2.30.1 | High | 2.29.8, 2.30.1 |
| Jul 22 | n8n: Race Condition in Git Clone Node Allows Authenticated Users to Achieve Remote Code Execution CVE-2026-65598Highfixed in 1.123.64, 2.29.8, 2.30.1 | High | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Stored DOM XSS via Resource Locator `cachedResultUrl` CVE-2026-65592Highfixed in 1.123.64, 2.29.8, 2.30.1 | High | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Google Service Account Private Key Exposed in JWT Header CVE-2026-65599Mediumfixed in 1.123.64, 2.29.8, 2.30.1 | Medium | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Shared Credential Header Leak via HTTP Request Pagination Expression CVE-2026-59209Highfixed in 1.123.61, 2.27.4, 2.28.1 | High | 1.123.61, 2.27.4, 2.28.1 |
| Jul 22 | n8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration CVE-2026-59206Highfixed in 1.123.61, 2.27.4, 2.28.1 | High | 1.123.61, 2.27.4, 2.28.1 |