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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>