# BeaverCheck Audit Report — https://codesandbox.io **Date:** April 7, 2026 **URL:** https://codesandbox.io **Overall Grade:** C (76/100) **Report:** https://beavercheck.com/results/40247afa-7664-2e18-7e11-1e79b161ef4f ## Top Findings 1. **[CRITICAL]** /.env is publicly accessible — Security > Information Leakage 2. **[CRITICAL]** Content-Security-Policy header is missing — Security > Security Headers 3. **[CRITICAL]** HSTS header is missing — Security > Security Headers 4. **[CRITICAL]** No Content-Security-Policy header found — Security > Content Security Policy 5. **[CRITICAL]** No
landmark found — Accessibility > Landmark Structure --- ## Lighthouse Scores | Category | Score | |----------|-------| | Performance | 54 | | Accessibility | 95 | | Best Practices | 77 | | SEO | 92 | --- ## Security ### Security Headers (F — 5/100) *1 of 10 headers properly configured* - **[CRITICAL]** HSTS header is missing — Strict-Transport-Security forces browsers to use HTTPS, preventing downgrade attacks. Add the header with a max-age of at least 1 year. - **[WARNING]** X-Content-Type-Options header is missing — This header prevents MIME-type sniffing, which can lead to XSS attacks. Set it to 'nosniff'. - **[WARNING]** X-Frame-Options header is missing — This header prevents clickjacking by controlling who can embed your page in a frame. Set it to DENY or SAMEORIGIN. - **[WARNING]** Referrer-Policy header is missing — Controls how much referrer information is sent with requests. Set to 'strict-origin-when-cross-origin' or stricter. - **[WARNING]** Permissions-Policy header is missing — Controls which browser features (camera, microphone, geolocation) are allowed. Set it to restrict unused features. - **[CRITICAL]** Content-Security-Policy header is missing — CSP is the most important header for preventing XSS attacks. See the CSP section for detailed analysis. - **[WARNING]** Cross-Origin-Opener-Policy header is missing — COOP isolates your browsing context, preventing cross-origin side-channel attacks. Set to 'same-origin'. - **[WARNING]** Cross-Origin-Embedder-Policy header is missing — COEP prevents loading cross-origin resources without explicit permission. Required for SharedArrayBuffer and high-resolution timers. - **[WARNING]** X-Powered-By header reveals technology stack — This header discloses server technology (e.g. Express, PHP), helping attackers target known vulnerabilities. Remove it. - **[PASS]** Server header is present without version info ### Content Security Policy (F — 0/100) *No enforcing CSP policy found* - **[CRITICAL]** No Content-Security-Policy header found — CSP is the most effective defense against XSS attacks. Add a Content-Security-Policy header to restrict resource loading. ### TLS & Certificates (A+ — 100/100) *TLS 1.3, 7 checks passed* - **[PASS]** TLS 1.3 is used - **[PASS]** Strong cipher suite is used - **[INFO]** HTTP/2 is not negotiated — HTTP/2 provides multiplexing and header compression for better performance. - **[PASS]** Certificate is valid (expires in 84 days) - **[PASS]** Certificate chain has 2 certificates - **[PASS]** Certificate uses modern signature algorithm - **[PASS]** Certificate covers 2 domain(s) - **[PASS]** Certificate is issued by a trusted CA ### Cookie Security (A+ — 95/100) *2 cookies analyzed, 5 checks passed* - **[PASS]** Cookie '__cf_bm' has the Secure flag - **[PASS]** Cookie '__cf_bm' has the HttpOnly flag - **[WARNING]** Cookie '__cf_bm' has no SameSite attribute — Without an explicit SameSite attribute, browser default behavior varies. Set SameSite=Lax or Strict. - **[PASS]** Cookie '_cfuvid' has the Secure flag - **[PASS]** Cookie '_cfuvid' has the HttpOnly flag - **[PASS]** Cookie '_cfuvid' has SameSite=None --- ## Advanced Security ### Subresource Integrity (A+ — 100/100) *1 of 1 external resources have SRI* - **[PASS]** script from static.cloudflareinsights.com has SRI protection ### JS Library Vulnerabilities (A+ — 100/100) *No known vulnerabilities* - **[PASS]** No known JavaScript library vulnerabilities detected ### Information Leakage (B — 70/100) *Critical exposure detected* - **[CRITICAL]** /.env is publicly accessible — Configuration file is accessible from the web. This may expose database credentials, API keys, or other secrets. - **[PASS]** security.txt is present — good practice ### Email Security (A — 85/100) *DMARC: quarantine* - **[PASS]** DMARC policy is quarantine — good protection ### Permissions-Policy (D — 40/100) *No header set* - **[WARNING]** No Permissions-Policy header — Consider adding a Permissions-Policy header to restrict browser feature access from embedded content. ### CORS Configuration (B — 80/100) *No CORS headers* - **[PASS]** No CORS headers present — secure default --- ## Performance ### Page Weight Budget (F — 5/100) *3.8 MB transferred, 58 requests* - **[WARNING]** Page weighs 5.5 MB (3.8 MB transferred) - **[INFO]** Fonts are 3.0 MB — consider subsetting or using system fonts — Subset fonts to include only used characters, or switch to system font stacks. - **[WARNING]** JavaScript is 637 KB — consider code splitting or lazy loading — Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts. - **[INFO]** 58 HTTP requests - **[INFO]** Estimated 0.79 g CO2 per page load ### Third-Party Impact (A+ — 100/100) *2% third-party, 0 ms blocking* - **[INFO]** Third-party code accounts for 2% of page weight (58.8 KiB of 3.8 MiB) - **[PASS]** Third-party blocking time is low (0 ms) ### Text Compression (A+ — 100/100) *All text resources are compressed* - **[PASS]** All text resources are compressed ### Image Optimization (B — 75/100) *18 images, 0 KB saveable* - **[PASS]** All images are well-optimized ### JS Execution Cost (F — 20/100) *5658ms total JS execution* - **[WARNING]** https://codesandbox.io/: 2715ms CPU time - **[WARNING]** https://codesandbox.io/_next/static/chunks/7157-f1...: 837ms CPU time - **[WARNING]** https://codesandbox.io/cdn-cgi/challenge-platform/...: 501ms CPU time - **[WARNING]** https://codesandbox.io/_next/static/chunks/3a1fbd1...: 469ms CPU time - **[WARNING]** Unattributable: 414ms CPU time - **[INFO]** Third-party scripts: 621ms (11% of total) ### Font Loading (A+ — 100/100) *3 fonts (3089 KB)* - **[INFO]** 3 font(s) use font-display: swap (FOUT risk but functional) ### JS Bundles (D — 40/100) *26 scripts, 317 KB unused* - **[WARNING]** https://codesandbox.io/_next/static/chunks/9230-85...: 85 KB unused (96%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://codesandbox.io/_next/static/chunks/9331-ab...: 69 KB unused (55%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://codesandbox.io/_next/static/chunks/ec0da94...: 45 KB unused (90%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://codesandbox.io/_next/static/chunks/2409-a2...: 36 KB unused (73%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://codesandbox.io/_next/static/chunks/ef9c525...: 34 KB unused (77%) — Consider code splitting or tree shaking to reduce unused code. - **[INFO]** Total unused JavaScript: 317 KB ### Resource Caching (A+ — 100/100) *All resources properly cached* - **[PASS]** No caching issues found ### Critical Rendering Path (A+ — 100/100) *No render-blocking resources* - **[PASS]** No render-blocking resources detected ### Resource Hints (A+ — 100/100) *2 hints, 0 missing preconnects* - **[PASS]** Page uses 2 resource hint(s) ### Render-Blocking Resources (A+ — 100/100) *No render-blocking resources detected* - **[PASS]** No render-blocking resources detected in ### Third-Party Resources (A+ — 100/100) *No third-party resources detected* --- ## Content Quality ### Links (A — 95/100) *100 links checked, 99 healthy, 1 broken* - **[WARNING]** 99 of 100 links are healthy - **[CRITICAL]** Broken link: https://www.codesandbox.community/ — Found in . Get "https://www.codesandbox.community/": remote error: tls: handshake failure ### Mixed Content (A+ — 100/100) *No mixed content detected — all resources use HTTPS.* - **[PASS]** No mixed content detected — all resources use HTTPS ### Open Graph (A+ — 100/100) *Open Graph tags are well configured for social sharing.* ### Structured Data (C — 40/100) *No structured data (JSON-LD) found.* - **[INFO]** No structured data (JSON-LD) found — Adding structured data helps search engines understand your content and can enable rich results. --- ## Infrastructure ### DNS Records (A+ — 100/100) *2 A records, 32 ms lookup* - **[PASS]** Resolves to 2 IPv4 address(es) - **[PASS]** Has 2 IPv6 (AAAA) record(s) - **[PASS]** 2 nameserver(s) configured - **[PASS]** 5 mail exchanger(s) configured - **[INFO]** CAA records not checked — CAA record lookup requires a specialized DNS resolver. This check will be available in a future update. - **[PASS]** SPF record present in TXT - **[PASS]** DNS resolution time: 32 ms ### Redirect Chain (A+ — 100/100) *No redirects — direct access* - **[PASS]** No redirects — direct access ### IPv6 Readiness (A+ — 100/100) *IPv6 reachable (17 ms)* - **[PASS]** IPv6 is configured and reachable at 2a06:98c1:3103::ac40:90f7, 2a06:98c1:310a::6812:2b09 ### Crawlability (A+ — 95/100) *robots.txt present, sitemap with 1 URLs* - **[PASS]** robots.txt is present - **[PASS]** sitemap.xml is present - **[PASS]** sitemap.xml is valid XML - **[PASS]** sitemap.xml contains 1 entries - **[PASS]** Sitemap index with 1 child sitemaps - **[INFO]** robots.txt does not reference a sitemap — Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap. ### URL Variants (A+ — 100/100) *www/non-www, trailing slash, HTTP→HTTPS* - **[PASS]** www/non-www redirect configured correctly (preferred: non-www) - **[PASS]** HTTP correctly 301-redirects to HTTPS ### Domain Intelligence (A+ — 100/100) *codesandbox.io — via NameCheap, Inc., 9 years, 6 months old* - **[PASS]** Domain registered until Nov 23, 2029 (3 years, 8 months remaining) - **[PASS]** Registrar: NameCheap, Inc. --- ## Compliance ### WCAG Compliance (A+ — 100/100) *No testable criteria* ### Cookie Consent & Privacy (B — 80/100) *No consent signals detected* - **[WARNING]** No privacy policy link detected — A privacy policy page is recommended for transparency and may be legally required. - **[INFO]** No terms of service link detected - **[INFO]** No cookie consent banner detected - **[PASS]** 2 cookie(s) set on initial load (functional) - **[INFO]** This is an automated check, not legal advice — BeaverCheck detects technical indicators of consent management. This does not constitute a legal compliance assessment. Consult a privacy professional for GDPR/CCPA compliance. ### Language & i18n (A — 90/100) *Lang attribute present* - **[PASS]** attribute is present - **[PASS]** value is valid - **[INFO]** No Content-Language HTTP header - **[INFO]** Language signals are inconsistent — The attribute and Content-Language header should agree. ### Readability & Typography (A+ — 100/100) *Font sizes and tap targets checked* ### Viewport Configuration (A+ — 100/100) *Viewport properly configured* - **[PASS]** Viewport meta tag is present - **[PASS]** width=device-width is set - **[PASS]** User zooming is allowed ### Third-Party Trackers (C — 55/100) *1 trackers detected* - **[INFO]** 1 third-party trackers detected — Found 1 analytics, 0 advertising, 0 marketing, 0 tag manager trackers. - **[WARNING]** Trackers detected but no cookie policy found — This page loads 1 trackers but no cookie policy was detected. GDPR requires disclosure when using tracking cookies. - **[WARNING]** Trackers detected but no privacy policy found — Most data protection regulations require a privacy policy when collecting user data via trackers. --- ## Legal ### Legal Page Ecosystem (F — 30/100) *1 of 7 expected legal pages detected* - **[WARNING]** Privacy Policy not detected — No link matching common Privacy Policy URL patterns or link text was found. Most websites are expected to have a Privacy Policy, especially those collecting user data. - **[PASS]** Terms of Service detected — Found at /legal/terms, linked from footer. - **[INFO]** Cookie Policy not detected — No link matching common Cookie Policy URL patterns or link text was found. Most websites are expected to have a Cookie Policy, especially those collecting user data. - **[INFO]** Accessibility Statement not detected — No link matching common Accessibility Statement URL patterns or link text was found. Most websites are expected to have a Accessibility Statement, especially those collecting user data. - **[INFO]** DMCA / Copyright Notice not detected — No link matching common DMCA / Copyright Notice URL patterns or link text was found. Most websites are expected to have a DMCA / Copyright Notice, especially those collecting user data. - **[INFO]** Refund / Returns Policy not detected — No link matching common Refund / Returns Policy URL patterns or link text was found. Most websites are expected to have a Refund / Returns Policy, especially those collecting user data. - **[INFO]** Acceptable Use Policy not detected — No link matching common Acceptable Use Policy URL patterns or link text was found. Most websites are expected to have a Acceptable Use Policy, especially those collecting user data. ### Copyright Notice (A+ — 100/100) *© 2026 CodeSandbox BV* - **[PASS]** Copyright notice is up to date — Copyright notice is up to date: © 2026 CodeSandbox BV - **[PASS]** Copyright holder: CodeSandbox BV ### Regulatory Indicators *2 regulatory indicator(s) detected* - **[INFO]** This is a technical scan, not a legal assessment — BeaverCheck detects technical indicators that may suggest regulatory relevance. This is not a compliance audit and should not be relied upon for legal decisions. Consult qualified legal counsel for compliance assessments. - **[INFO]** GDPR indicators detected (moderate confidence) — Indicators suggesting GDPR may be relevant: Privacy policy page found. EU General Data Protection Regulation — governs collection and processing of personal data of EU residents. - **[INFO]** HIPAA indicators detected (weak confidence) — Indicators suggesting HIPAA may be relevant: Text mentions: phi. Health Insurance Portability and Accountability Act — protects sensitive patient health information. ### Third-Party Data Sharing *1 third-party service(s) detected* - **[INFO]** Data inventory for transparency purposes — This inventory identifies third-party services that receive data from your site visitors. Under regulations like GDPR (Article 30), maintaining records of data processing activities is commonly considered a best practice. This automated scan provides a starting point — it may not capture all data flows. - **[INFO]** 1 third-party services across 1 categories — 1 third-party services detected across 1 categories: CDN (1). Each of these services receives some user data from your site visitors. - **[INFO]** Cloudflare (CDN) — Detected via cookie name. Typically collects: IP address (transient), Request metadata. Privacy policy: https://www.cloudflare.com/privacypolicy/. Data Processing Agreement available. ### Compliance Badges (B — 70/100) *1 compliance badge(s) detected* - **[PASS]** TRUSTe / TrustArc badge detected — Found via body text: 'truste'. Note: the presence of a badge does not verify the certification is current or valid. --- ## Availability ### CDN & Delivery (A — 85/100) *Cloudflare (DYNAMIC)* - **[PASS]** Site is served via Cloudflare CDN (edge: CDG) - **[INFO]** CDN cache status: DYNAMIC ### HTTP Caching (B — 75/100) *s-maxage=31536000, stale-while-revalidate* - **[PASS]** Cache-Control header is set - **[PASS]** CDN TTL: 52 weeks (s-maxage=31536000) - **[INFO]** No ETag or Last-Modified header — Conditional requests (304 Not Modified) are not possible without validators. ### Transport Security (A — 85/100) *HTTP/3, HSTS, and TLS version analysis* - **[PASS]** HTTP/3 (QUIC) supported — The server advertises HTTP/3 via Alt-Svc for faster connections on mobile networks. - **[WARNING]** Missing Strict-Transport-Security header — HSTS tells browsers to only use HTTPS, preventing SSL stripping attacks. - **[PASS]** TLS 1.3 in use (fastest handshake, 1-RTT) --- ## Accessibility ### Landmark Structure (D — 50/100) *4 landmarks* - **[CRITICAL]** No
landmark found — Screen reader users cannot quickly navigate to the primary content. Wrap your main content in
. - **[PASS]** 2