email_manager - render email body in sandboxed iframe#1521
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email_manager - render email body in sandboxed iframe#1521
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Prevents stored XSS by rendering email HTML content inside a sandboxed iframe (srcdoc) rather than injecting it directly into the page DOM.
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Summary
Render email body HTML inside a sandboxed
<iframe srcdoc="...">in bothemail_pure.htmlandemail_detail.html, rather than injecting it directly into the page DOM via| safe.This prevents any script content in stored email bodies from executing in the viewer's browser.
Relates to SACGF/variantgrid_private#3828.
Test plan
/email_manager/pure/<id>— body renders correctly in the standalone window