fix(builder): escape/allowlist all attribute-value sinks incl. numeric/enum props (XSS)

An adversarial pass found 5 Critical XSS sinks where props declared number/enum in TypeScript were interpolated raw into exported HTML attribute values, trusting the type — but nothing enforces it at runtime (AI update_props only validates node_id; deserialized saved state is untyped JSON). Fixed all 5 (NumberCounter data-target, StarRating aria-label, FormContainer method, ContactForm/InputField input type) plus 6 sibling sinks found by an exhaustive audit of every attribute-value interpolation across src/components: a JS-source injection into ContentSlider's inline setInterval script, a prototype-pollution-adjacent allowlist gap in Section's divider-shape lookup, TextareaField rows, Testimonials rating aria-label, HeroSimple textAlign, and MapEmbed zoom. Adds shared sanitizeFormMethod/sanitizeInputType allowlist helpers to utils/escape.ts alongside the existing escapeAttr/safeUrl/cssValue primitives. Every fix is TDD'd: a malicious-value test reproduces the raw injection against the pre-fix code, then passes after the fix. 502 tests green (npx vitest run), tsc + vite build green (npm run build). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-12 18:03:44 -07:00
parent 7ba91d9829
commit 591a51dcc2
45 changed files with 1039 additions and 26 deletions
@@ -0,0 +1,62 @@
+import { describe, test, expect } from 'vitest';
+import { Logo } from './Logo';
+
+/*
+ * Regression coverage for Logo.toHtml -- audited during the toHtml
+ * attribute-XSS sweep (see task-cssxss-brief.md) and found already fully
+ * sanitized (href/src via escapeAttr(safeUrl()), alt/text via escapeAttr /
+ * escapeHtml, imageWidth/fontSize/etc. routed through cssPropsToString which
+ * sanitizes every value regardless of declared type). No fix was required;
+ * these tests lock that behavior in against regressions.
+ */
+const toHtml = (Logo as any).toHtml;
+
+describe('Logo.toHtml href sanitization (attacker-controlled `href` prop)', () => {
+  test('a javascript: URL is neutralized', () => {
+    const { html } = toHtml({ href: 'javascript:alert(1)' }, '');
+    expect(html).not.toContain('javascript:alert');
+  });
+
+  test('a quote-breakout href does not escape the anchor attribute', () => {
+    const malicious = '"><script>alert(1)</script>';
+    const { html } = toHtml({ href: malicious }, '');
+    expect(html).not.toContain('<script>alert(1)</script>');
+  });
+});
+
+describe('Logo.toHtml image src/alt sanitization (type="image")', () => {
+  test('a javascript: imageSrc is neutralized', () => {
+    const { html } = toHtml({ type: 'image', imageSrc: 'javascript:alert(1)', text: 'Logo' }, '');
+    expect(html).not.toContain('javascript:alert');
+  });
+
+  test('a quote-breakout alt (from `text`) does not escape the img attribute', () => {
+    const malicious = '"><script>alert(1)</script>';
+    const { html } = toHtml({ type: 'image', imageSrc: 'https://example.com/logo.png', text: malicious }, '');
+    expect(html).not.toContain('<script>alert(1)</script>');
+  });
+
+  test('a non-numeric imageWidth (attribute-breakout attempt) does not escape the style attribute', () => {
+    const malicious = '1"><script>alert(1)</script>';
+    const { html } = toHtml({ type: 'image', imageSrc: 'https://example.com/logo.png', imageWidth: malicious }, '');
+    expect(html).not.toContain('<script>alert(1)</script>');
+  });
+});
+
+describe('Logo.toHtml text-logo styling sanitization', () => {
+  test('a quote-breakout color does not escape the span style attribute', () => {
+    const malicious = 'red" onmouseover="alert(1)';
+    const { html } = toHtml({ type: 'text', text: 'MySite', color: malicious }, '');
+    // The raw `"` must never survive un-escaped inside the style attribute
+    // value -- if it did, `onmouseover` would land as a REAL new HTML
+    // attribute (breakout) rather than being inert CSS-value garbage inside
+    // a properly-escaped style="...".
+    expect(html).not.toMatch(/style="[^"]*"[^>]*onmouseover/);
+  });
+
+  test('a normal logo renders as expected', () => {
+    const { html } = toHtml({ type: 'text', text: 'MySite', href: '/' }, '');
+    expect(html).toContain('href="/"');
+    expect(html).toContain('MySite');
+  });
+});