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Security report for polyfill-fastly.net

Fastly · Technology · N/a

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

Fastly Polyfill is a specialized web service provided by Fastly Inc. that delivers browser polyfills tailored to the requesting browser's needs. The service targets web developers seeking to optimize web compatibility and performance by loading only necessary polyfills. The website is professionally designed with a clear focus on technical users, offering a customizable interface for selecting polyfill bundles. The presence of official Fastly legal pages and a GitHub repository link enhances trust and transparency. Technically, the site uses modern CSS (Pico CSS) and JavaScript to provide a responsive and accessible user experience. Hosting and domain registration align with Fastly's infrastructure, indicating a well-managed technical environment. However, some security best practices like DNSSEC and security headers could be improved to enhance the security posture. Security-wise, the domain is protected with standard domain status flags preventing unauthorized transfers or deletions. No WAF or blocking mechanisms are detected, and the site uses HTTPS (implied by URL structure). Privacy compliance is supported by a comprehensive privacy policy, though no cookie consent mechanism is present. No direct contact or incident response information is provided, which could be a gap for security communications. Overall, the website is trustworthy, technically sound, and serves a clear niche in the web development ecosystem. Strategic improvements in security headers and cookie consent would further strengthen its compliance and security posture.

Scanned

This is an earlier scan of polyfill-fastly.net. View the latest report

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.net

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.

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Recommended

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  • 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 as a service under Fastly Inc., focusing on delivering browser polyfills efficiently. Its market positioning is niche but important within the web development and CDN space, offering value by optimizing browser compatibility. The business model is service-oriented, likely integrated with Fastly's broader CDN offerings. The target customers are developers and technical teams requiring polyfill solutions. The site demonstrates consistent branding and professional content, with growth potential tied to Fastly's market presence. Partnerships or subsidiaries are not explicitly indicated beyond Fastly's corporate umbrella. Revenue streams are not detailed but presumably derive from Fastly's service ecosystem. The GitHub presence suggests an open-source or community engagement approach. The lack of direct contact info or detailed business disclosures limits deeper business intelligence but aligns with a focused technical service offering.

Security posture

The security posture of the Fastly Polyfill website is moderate to good. The domain is registered with protections against unauthorized changes, and HTTPS is used, ensuring encrypted communications. However, the absence of DNSSEC and explicit security headers (e.g., CSP, HSTS) indicates room for improvement. No vulnerabilities or exposed sensitive data were detected in the content or scripts. The site lacks explicit incident response or security policy disclosures, which could hinder rapid response to security events. Privacy compliance is supported by a comprehensive privacy policy, but cookie consent mechanisms are missing, which may be a compliance risk in some jurisdictions. The site does not expose contact information for security incidents or data protection officers, limiting transparency. Overall, the site is secure for its purpose but would benefit from enhanced security controls and compliance disclosures.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement and verify security headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options.
  3. Add a cookie consent mechanism to comply with GDPR and other privacy regulations.
  4. Publish a dedicated security policy and incident response contact information to improve transparency and readiness.
  5. Regularly audit and update third-party libraries and scripts to avoid vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Fastly
Description
Fastly Polyfill is a service that accepts requests for browser features and returns only the polyfills needed by the requesting browser.
Key services
Polyfill delivery service, Customizable polyfill bundles
Content quality
good
Branding
consistent

Technology

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

Security

Observed score
70/100
Good practices seen
  • Domain status includes clientDeleteProhibited, clientTransferProhibited, clientUpdateProhibited

Analytics and tracking

Tracking level
minimal
Privacy practices
good

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, well-structured, and user-friendly.
  3. No direct contact information or security policies beyond standard legal pages.
  4. No cookie consent mechanism detected despite privacy policy presence.
  5. Domain is newly registered but consistent with Fastly's brand and services.
  6. No signs of WAF or content blocking; full content accessible.
Technical notes

Notes

The website uses modern CSS (Pico CSS) and JavaScript to deliver a responsive and accessible user interface. The polyfill service is dynamically configurable via JavaScript, allowing users to select polyfill bundles and versions. Hosting appears to be on Fastly's infrastructure, leveraging their CDN capabilities for performance and reliability. The site is mobile-optimized and accessible with good semantic HTML structure. No CMS or major frameworks were detected, indicating a lightweight custom implementation. Performance is likely fast due to minimal external dependencies and CDN hosting. The technical debt appears low, but security enhancements and SEO improvements could be considered. Overall, the technical implementation supports the business goals effectively with room for incremental improvements.
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
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