Entity-escaping alone doesn't protect JS-string or raw-HTML sinks:
- HtmlBlock.toHtml exported props.code raw; now runs it through the
same purifyHtml (DOMPurify) config already used for the live editor
preview, so <script>/on*= payloads can't survive export either.
- Countdown.toHtml interpolated targetDate directly into
`new Date("${targetDate}")` inside an inline <script> -- a value
like `2026-01-01");alert(1)//` broke out of the string literal. Now
validated against a strict date/datetime shape and JSON.stringify'd
before embedding, falling back to `new Date()` for anything invalid.
- Gallery.toHtml's lightbox used
`onclick="${id}_open('${esc(img.src)}')"`, which a single quote in
img.src could break out of. Replaced with a `data-lb-src` attribute
per thumbnail and one delegated click listener on the grid
(`e.target.closest('[data-lb-src]')`) instead of a per-item inline
handler string.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
