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fix(builder): sanitize CSS-value sinks to prevent style/<style> breakout XSS

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Adds a single cssValue() sanitizer (src/utils/escape.ts) that strips
<>{};"'\ and neutralizes url(), safe for both style="..." attribute and
<style>...</style> element contexts. Applies it at every raw user-prop
CSS-value interpolation sink found via grep across src/components (colors,
sizes, gaps interpolated directly into style strings/<style> blocks),
including the highest-risk <style>-context sinks: ColumnLayout gap,
Menu/Navbar hover and background colors. Also Number()-coerces the
`columns` grid-template-columns sinks in Gallery/Testimonials/NumberCounter
as defense in depth. Regression tests assert </style><script> payloads are
neutralized and normal colors still render.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
shadowdao
2026-07-12 15:56:25 -07:00
co-authored by Claude Opus 4.8
parent 5acf172511
commit 36c3b2f503
24 changed files with 318 additions and 70 deletions
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craft/src/components/sections/HeroSimple.tsx
+6 -4
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@@ -2,7 +2,7 @@ import React, { CSSProperties } from 'react';
import { useNode, UserComponent } from '@craftjs/core';
import { cssPropsToString } from '../../utils/style-helpers';
import { CtaButton, normalizeCtas, ctaInlineStyle, ctasToHtml } from './_cta-helpers';
import { escapeHtml, escapeAttr, safeUrl } from '../../utils/escape';
import { escapeHtml, escapeAttr, safeUrl, cssValue } from '../../utils/escape';
interface HeroProps {
heading?: string;
@@ -220,7 +220,8 @@ HeroSimple.craft = {
let overlayHtml = '';
if ((props.overlayOpacity || 0) > 0) {
overlayHtml = `<div style="position:absolute;top:0;left:0;right:0;bottom:0;background-color:${props.overlayColor || '#000'};opacity:${(props.overlayOpacity || 0) / 100};z-index:1"></div>`;
const overlayColor = cssValue(props.overlayColor) || '#000';
overlayHtml = `<div style="position:absolute;top:0;left:0;right:0;bottom:0;background-color:${overlayColor};opacity:${(props.overlayOpacity || 0) / 100};z-index:1"></div>`;
}
let videoHtml = '';
@@ -239,12 +240,13 @@ HeroSimple.craft = {
});
const idAttr = props.anchorId ? ` id="${escapeAttr(props.anchorId)}"` : '';
const heroTextColor = cssValue(props.textColor) || '#fff';
return {
html: `<section${idAttr} style="${sectionStyle}">
${videoHtml}${overlayHtml}
<div style="max-width:800px;width:100%;position:relative;z-index:2;text-align:${textAlign}">
<h1 style="font-size:48px;font-weight:700;color:${props.textColor || '#fff'};margin-bottom:16px;line-height:1.2">${escapeHtml(props.heading || '')}</h1>
<p style="font-size:20px;color:${props.textColor || '#fff'};opacity:0.85;margin-bottom:32px;line-height:1.6;white-space:pre-line">${escapeHtml(props.subtitle || '')}</p>
<h1 style="font-size:48px;font-weight:700;color:${heroTextColor};margin-bottom:16px;line-height:1.2">${escapeHtml(props.heading || '')}</h1>
<p style="font-size:20px;color:${heroTextColor};opacity:0.85;margin-bottom:32px;line-height:1.6;white-space:pre-line">${escapeHtml(props.subtitle || '')}</p>
<div style="display:flex;gap:12px;justify-content:${justifyBtn};flex-wrap:wrap">${buttonsHtml}</div>
</div>
</section>`,