GHSA-p3rg-hrf9-w9gj
n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview
Quick fix
GHSA-p3rg-hrf9-w9gj — n8n: upgrade to the fixed version with the command below.
npm install n8n@1.123.64Details
## 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.
Are you affected?
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Affected packages
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-p3rg-hrf9-w9gj [WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-65597 [ADVISORY]
- https://github.com/n8n-io/n8n [PACKAGE]
- https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64 [WEB]
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8 [WEB]
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1 [WEB]
- https://www.vulncheck.com/advisories/n8n-before-dom-based-xss-via-unsandboxed-iframe [WEB]