Files
hermes-webui/api
Nathan Esquenazi 4c798e4313 fix(security): CSP sandbox header for inline HTML preview
The iframe sandbox="allow-scripts" attribute on previewHtmlIframe only
applies when HTML is loaded INSIDE that iframe. A user tricked into
opening /api/file/raw?path=evil.html&inline=1 directly in a top-level
tab (e.g. via a chat link) would render the HTML in the WebUI's origin
without any sandbox, giving the page full access to cookies and
localStorage.

Server-side Content-Security-Policy: sandbox allow-scripts mirrors the
iframe sandbox exactly: scripts run, but the document is treated as a
unique opaque origin (no allow-same-origin) and cannot read WebUI
cookies, localStorage, or postMessage to the parent regardless of how
the URL is accessed.

Added test_inline_html_response_sets_csp_sandbox to pin the header.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-25 21:22:41 +00:00
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