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Security report for polyfill-fastly.io

DNStination Inc. · Technology · United States

Medium risk. 6 critical or high findings in Email security, Security headers and 2 other checks.

Security score

71/100

Risk levelMedium

0–100, higher is better. How it is calculated

The website 'Fastly Polyfill' provides a specialized service that dynamically delivers only the necessary JavaScript polyfills required by a user's browser, optimizing web application compatibility and performance. The service is targeted primarily at web developers and technology users who need to ensure cross-browser functionality. The business is relatively new, founded in 2024, and operates under DNStination Inc., a US-based organization. The website branding and content are consistent and professional, with clear navigation and a modern design using Pico CSS. The presence of links to Fastly's corporate privacy and terms pages suggests affiliation or infrastructure usage by Fastly, a recognized CDN provider. Technically, the site employs modern web standards and technologies, including JavaScript and a lightweight CSS framework, ensuring good performance and mobile optimization. The domain is hosted likely on Fastly's infrastructure, contributing to fast load times and reliable service delivery. The site includes interactive forms allowing users to customize polyfill bundles, reflecting a mature technical implementation. From a security perspective, the site uses HTTPS and does not expose sensitive data. However, it lacks explicit security headers and a published security policy or incident response contacts, which are areas for improvement. Privacy compliance is partial; while a privacy policy is linked, there is no cookie consent mechanism implemented. No direct contact information such as emails or phone numbers are provided on the site, which may impact user trust. Overall, the website presents a low-risk profile with a solid technical foundation and clear business purpose. Strategic recommendations include enhancing security headers, implementing cookie consent, publishing security and incident response policies, and providing direct contact information to improve trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

6 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  2. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  3. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

Need hands-on remediation? Email guard@offseq.com

Keep watching polyfill-fastly.io

This scan found 20 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
85
Security headers
50
Email security
60
DNS health
75
Network security
100
GDPR outside view
53
Average
71

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Fastly Polyfill operates in the technology sector, offering a niche service that dynamically delivers JavaScript polyfills tailored to the requesting browser's needs. This service supports web developers by optimizing web application compatibility and performance. The business model is service-oriented, likely generating revenue through usage or integration with Fastly's CDN services. The company is small and newly founded in 2024, positioning itself as a specialized tool within the web development ecosystem. The presence of a GitHub repository indicates an open or community-driven aspect, enhancing credibility and potential for collaboration. The website's affiliation with Fastly through branding and linked policies suggests strategic partnerships or infrastructure reliance. No direct contact or sales information is provided, indicating a focus on developer adoption rather than direct sales. Growth potential lies in expanding polyfill coverage and integration with broader web performance tools.

Security posture

The website demonstrates a good baseline security posture with HTTPS enforced and no visible exposure of sensitive data. The domain registration is transparent and consistent with the business identity, registered with a reputable registrar without privacy protection, which supports trustworthiness. However, the absence of explicit security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options reduces the overall security hardening. No published security policy or incident response information is available, limiting transparency in handling security events. The lack of a vulnerability disclosure policy or security.txt file further constrains responsible vulnerability management. Forms on the site appear secure with no indication of insecure input handling. Overall, the security posture is solid but could be enhanced by adopting additional security best practices and transparency measures.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement and publish explicit security headers including CSP, HSTS, and X-Frame-Options.
  3. Add a cookie policy and consent mechanism to comply with privacy regulations and improve user trust.
  4. Publish a security policy and incident response contact information to enhance transparency and readiness.
  5. Create and maintain a vulnerability disclosure program or security.txt file to facilitate responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
DNStination Inc.
Description
Fastly Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
Key services
Dynamic polyfill delivery, Custom polyfill bundle generation
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Pico CSS, HTML5, CSS3
Frameworks
Pico CSS
Performance
fast
Mobile
good
Accessibility
good
SEO
basic

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced (implied by URL scheme)
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected in scripts

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Transparency
poor

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website provides a specialized polyfill service for web developers
  2. Content is technical and well-structured with interactive form elements
  3. No direct contact emails or phone numbers found on the site
  4. Privacy and terms links point to Fastly corporate pages, indicating affiliation or usage of Fastly infrastructure
  5. No cookie consent mechanism present despite privacy policy link
  6. No explicit security or incident response policies published
  7. Modern CSS framework (Pico CSS) used for styling
  8. Domain is very new but registered with a reputable registrar and no privacy shield
  9. No advertising or tracking scripts detected
Technical notes

Notes

The website is built using modern web technologies including JavaScript and the Pico CSS framework, ensuring a lightweight and responsive design. The infrastructure is likely hosted on Fastly's CDN platform, providing fast content delivery and scalability. The HTML and CSS are valid and well-structured, supporting accessibility and SEO basics. The site includes interactive forms for customizing polyfill bundles, demonstrating advanced client-side scripting and dynamic content generation. No CMS or third-party analytics/tracking tools were detected, indicating a focus on performance and privacy. The domain is newly registered but uses a reputable registrar and consistent WHOIS data. Technical risks are minimal, though the absence of some security headers and privacy mechanisms represent areas for modernization and compliance improvement.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Earlier scans of this domain

  1. 71/100Medium29 findingsView report
  2. 71/100 +2Medium29 findingsView report
  3. 69/100Medium23 findingsView report
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