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Security report for sebastiandedeyne.com

Sebastian De Deyne · Technology · N/a

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

67/100

Risk levelMedium

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

sebastiandedeyne.com is a personal professional blog and portfolio site of Sebastian De Deyne, a web developer and designer. The site features a rich collection of blog posts focused on web development, programming, design, and related technology topics. It targets developers, designers, and tech enthusiasts, positioning itself as a trusted source of knowledge and inspiration in the web technology niche. The business model is primarily content-driven personal branding and knowledge sharing. The domain has been active since 2013, reflecting a mature and stable online presence.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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

7 findings rated critical or high. Fix these first.

  1. 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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';…

  2. GDPR outside view

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

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • 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 sebastiandedeyne.com

This scan found 21 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

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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
75
Security headers
50
Email security
70
DNS health
70
Network security
100
GDPR outside view
35
Average
67

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention sebastiandedeyne.com, from OffSeq Breach.

No leaked records found

Breach holds no records for sebastiandedeyne.com right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Technical appendix

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

Business context

Business profile

The website operates as a small-scale personal brand with a focus on web development and design. It leverages content marketing through blog posts and curated links to build authority and engage its audience. The site integrates with modern tools like Fathom Analytics for privacy-conscious tracking and uses Cloudflare for domain registration and DNS services. There is no evidence of commercial transactions or partnerships, indicating a primarily informational and portfolio purpose. The consistent content quality and professional presentation suggest a well-maintained digital presence with potential for growth in audience and influence.

Security posture

The site benefits from HTTPS encryption and a stable domain registration with Cloudflare, enhancing trust and security. However, it lacks advanced security headers and DNSSEC, which could improve protection against certain attacks. No privacy or cookie policies are published, representing a compliance gap with GDPR and other privacy regulations. The absence of contact information and incident response details limits transparency in security matters. Overall, the security posture is good but could be enhanced by implementing recommended best practices and compliance documentation.

Recommendations

  1. Publish a comprehensive privacy policy and cookie policy to improve GDPR compliance and user trust.
  2. Implement security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Enable DNSSEC to strengthen DNS security and prevent spoofing.
  4. Add clear contact information including a security or abuse contact email to facilitate incident reporting.
  5. Consider publishing a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sebastian De Deyne
Description
I'm a web developer and designer. I build websites & interfaces with JavaScript, CSS and PHP.
Key services
Web development, Web design, Programming insights, Technical blogging
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, CSS, PHP, Typekit fonts, Tailwind CSS (implied by content), React (mentioned in blog content), Fathom Analytics
Frameworks
Laravel (mentioned in blog content), Tailwind CSS
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enabled
  • Domain status clientTransferProhibited
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

Services
Fathom Analytics
Tracking level
minimal
Privacy practices
poor

Advertising

Tracking pixels
Fathom Analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is a personal blog and portfolio of a web developer and designer.
  2. Content is rich, well-structured, and professionally presented.
  3. No privacy or cookie policies found, which is a compliance gap.
  4. No contact emails or phone numbers explicitly provided on the site.
  5. Uses modern web technologies and analytics with minimal tracking.
  6. No security.txt or vulnerability disclosure policy found.
  7. No signs of WAF or content blocking; site fully accessible.
  8. WHOIS data shows domain is stable and consistent with site content.
Technical notes

Notes

The website uses a modern technology stack including JavaScript, CSS, PHP, and Tailwind CSS, with fonts served via Adobe Typekit and analytics via Fathom. The site is hosted with Cloudflare DNS and registrar services, ensuring reliable performance and security. The HTML structure is valid and optimized for mobile devices, with good SEO metadata and Open Graph tags for social sharing. Performance is fast, and accessibility is good. There is no CMS detected, indicating a custom or static site approach. The site could benefit from additional security headers and privacy compliance features to reduce technical risks.
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

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