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Security report for nyenburgh.com

Nyenburgh Holding B.V. · Finance · Netherlands

High risk. 8 critical or high findings in Network security, Security headers and 3 other checks.

Security score

49/100

Risk levelHigh

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

Nyenburgh Holding B.V. is a Dutch licensed proprietary trading firm specializing in providing liquidity to global financial markets through proprietary and arbitrage trading strategies. The company operates with a robust infrastructure co-located in major financial hubs including New York, Frankfurt, Milan Bergamo, and London, ensuring low-latency access and data for professional traders. Regulated by the Netherlands Authority for Financial Markets (AFM) and the Dutch Central Bank (DNB), Nyenburgh emphasizes risk management and operates solely with its own capital, not involving client funds. Technically, the website is built on WordPress using the Enfold theme, incorporating modern web technologies such as jQuery and YouTube iframe API. The site is mobile-optimized with good SEO practices and includes a comprehensive cookie consent mechanism compliant with GDPR. However, no explicit security headers were detected, and no direct contact emails or phone numbers are publicly listed, with contact primarily via a web form. From a security perspective, the site enforces HTTPS and implements cookie consent, but lacks visible advanced security policies or incident response information. The WHOIS data is unavailable, which limits domain trust verification, though the website content and regulatory references support legitimacy. Overall, the site presents a professional and trustworthy front with room for improvement in security transparency and contact information availability. Strategically, Nyenburgh should enhance its security posture by implementing recommended HTTP security headers, publishing incident response contacts, and considering a security.txt file. Improving accessibility and providing clearer direct contact details would also strengthen user trust and compliance. These steps will help maintain its market position as a reputable and secure proprietary trading firm.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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

8 findings rated critical or high. Fix these first.

  1. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • Critical

      Critical Service Exposed: MySQL

      Port 3306 (MySQL) is publicly accessible - MySQL - Database server

      What to do: Immediately restrict access to MySQL using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

  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 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 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

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

Keep watching nyenburgh.com

This scan found 24 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
62
Security headers
15
Email security
80
DNS health
80
Network security
0
GDPR outside view
68
Average
51
After the cap
49

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 · found on this site
  • 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

Nyenburgh operates in the competitive proprietary trading sector, leveraging its licensed status and regulatory compliance as key differentiators. Its global co-located infrastructure and prime brokerage partnerships provide competitive advantages in speed and market access. The business model focuses on trading its own capital, mitigating client fund risks and regulatory complexities associated with brokerage services. The target audience includes professional traders and financial institutions seeking liquidity and arbitrage opportunities. The company’s 27+ years of experience and presence in major financial centers indicate maturity and stability. Partnerships such as with NYIP suggest a strategic ecosystem approach. Revenue streams likely derive from trading profits and possibly training or partnership collaborations. Growth indicators include infrastructure expansion and regulatory adherence. Overall, Nyenburgh positions itself as a specialized, professional trading firm with a strong compliance and operational foundation.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and a GDPR-compliant cookie consent mechanism. However, the absence of explicit security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options indicates potential gaps in defense-in-depth strategies. No vulnerabilities or exposed sensitive data were detected in the provided content. The lack of published incident response or security policy information suggests limited transparency in security governance. Compliance with GDPR is evident through privacy and cookie policies, but no direct contact for security incidents or data protection officers was found. The security culture appears basic, focusing on regulatory compliance rather than proactive security communication. Enhancing security headers, publishing incident response contacts, and conducting regular third-party script audits would improve the security posture and business resilience.

Recommendations

  1. Implement comprehensive HTTP security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web vulnerabilities.
  2. Publish clear security policy and incident response contact information on the website to improve transparency and readiness.
  3. Conduct regular security audits of third-party scripts and plugins to identify and remediate potential vulnerabilities.
  4. Enhance website accessibility features to comply with best practices and improve user experience for all visitors.
  5. Consider creating and publishing a security.txt file to facilitate responsible vulnerability disclosure and improve trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Nyenburgh Holding B.V.
Description
Nyenburgh is a Dutch licensed proprietary trading firm headquartered in Amstelveen. It trades for its own account and risk, providing liquidity to financial markets. The company operates co-located infrastructure in New York, Frankfurt, Milan Bergamo, and London, and maintains a global network of prime brokerage partners. It is regulated by the Netherlands Authority for Financial Markets (AFM) and the Dutch Central Bank (DNB).
Key services
Proprietary Trading, Arbitrage Trading, Trading Infrastructure, Training, Risk Management
Content quality
good
Branding
consistent

Technology

Stack
WordPress 5.8.10, Enfold Theme 4.8.6, jQuery 3.6.0, YouTube iframe API, Google Fonts
Frameworks
WordPress
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data found

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 is fully accessible with rich content
  2. No WAF or blocking detected
  3. Uses WordPress CMS with Enfold theme
  4. Cookie consent and privacy policy implemented in Dutch
  5. No direct contact emails or phone numbers found on homepage; contact via form
  6. No explicit security headers detected in provided data
  7. WHOIS data unavailable, limiting domain trust verification
  8. Business is regulated and licensed in the Netherlands
  9. No advertising or tracking scripts detected beyond YouTube and Google Fonts
Technical notes

Notes

The website is built on a mature WordPress platform using the Enfold theme, leveraging modern web technologies such as jQuery and YouTube iframe API for multimedia content. The site loads Google Fonts dynamically with user consent, indicating attention to privacy compliance. Performance is moderate, with no explicit hosting provider identified. Mobile optimization is good, and SEO practices are evident through meta tags and structured navigation. However, the absence of advanced security headers and limited accessibility features suggest areas for technical improvement. The site’s technical debt appears manageable, with opportunities for modernization including enhanced security configurations and improved accessibility compliance. Overall, the technical infrastructure supports the business needs but would benefit from targeted enhancements to security and user experience.
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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