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Security report for circle-hub.de

Circle – Hub für Urban Mining · Other · Germany

Medium risk. 5 critical or high findings in Security headers and SSL/TLS.

Security score

53/100

Risk levelMedium

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

Circle Hub is a German-based platform and network dedicated to promoting circular economy and urban mining practices within the construction and environmental sectors. The website showcases a broad partner ecosystem including construction companies, environmental labs, consulting firms, and recycling specialists, emphasizing sustainable building and resource efficiency. The business model revolves around facilitating collaboration and knowledge exchange among stakeholders to advance circular economy initiatives. Technically, the site is built on Silverstripe CMS 5.4 with modern frontend technologies like Bootstrap and Swiper.js, offering good mobile responsiveness and user experience. Security posture is moderate with HTTPS implied but lacking explicit security headers and formal security policies. Privacy compliance is strong with a clear cookie consent mechanism and GDPR-aligned cookie policy. Overall, the website is professional, trustworthy, and well-positioned in its niche market.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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

5 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 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';…

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching circle-hub.de

This scan found 27 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
42
Security headers
15
Email security
75
DNS health
65
Network security
40
GDPR outside view
83
Average
53

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

The company operates as an important entity within the circular economy and urban mining niche, targeting businesses and organizations in construction, recycling, and environmental services. Its competitive advantage lies in its extensive partner network and focus on sustainability and innovation. Revenue streams likely derive from network facilitation, consulting, and possibly membership or service fees. The partnership ecosystem is robust, featuring many reputable companies and institutions. Growth indicators include active partner engagement and a modern digital presence. Strategic observations suggest opportunities to enhance security policies and expand direct contact options to improve trust and compliance.

Security posture

The website demonstrates a moderate security maturity level with HTTPS usage and cookie consent mechanisms in place. However, it lacks visible security headers such as Content Security Policy, HSTS, and X-Frame-Options, which are recommended best practices. No vulnerability disclosures or incident response contacts are provided, indicating gaps in security transparency. Data protection practices appear aligned with GDPR through cookie management, but absence of a dedicated privacy or security policy page limits clarity. Incident response readiness and security culture indicators are minimal. Overall, the security posture is adequate but could be significantly improved with formal policies and technical enhancements.

Recommendations

  1. Implement comprehensive security headers including CSP, HSTS, and X-Frame-Options to enhance protection against common web attacks.
  2. Publish explicit security and incident response policies, including a vulnerability disclosure program or security.txt file.
  3. Add clear and direct contact information such as company emails and phone numbers to improve transparency and user trust.
  4. Enhance accessibility features to meet higher standards and improve user experience for all visitors.
  5. Regularly audit and update privacy and cookie policies to maintain GDPR compliance and reflect current data practices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Circle – Hub für Urban Mining
Description
Circle Hub is a platform and network focused on circular economy and urban mining in the construction and environmental sectors. It connects partners from construction, recycling, environmental analysis, consulting, and related industries to promote sustainable building practices and resource efficiency.
Key services
Partner network, Information and consulting on circular economy, Platform for collaboration, Promotion of sustainable construction practices
Content quality
good
Branding
consistent

Technology

Stack
Silverstripe CMS 5.4, Bootstrap Icons, Swiper.js, Bootstrap 5 (offcanvas, buttons, modal), CSS with SCSS preprocessing
Frameworks
Silverstripe CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • HTTPS implied by base href https://www.circle-hub.de/
  • Cookie consent with options for necessary and analytics cookies

Analytics and tracking

Tracking level
moderate
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 uses Silverstripe CMS 5.4 with modern frontend libraries.
  2. Comprehensive partner network with detailed partner profiles.
  3. Cookie consent banner present with options for cookie acceptance.
  4. No explicit privacy or security policy pages found except cookie policy.
  5. No visible email addresses or phone numbers on homepage; contact via form.
  6. No security.txt or vulnerability disclosure found.
  7. No social media links detected in provided HTML.
  8. Website is in German language targeting German market.
  9. No advertising or tracking scripts detected in provided content.
  10. Good mobile optimization and navigation clarity.
Technical notes

Notes

The website is built on a modern CMS platform (Silverstripe 5.4) with a clean frontend using Bootstrap and Swiper.js for UI components. The site is mobile optimized and offers good navigation clarity. Hosting is likely provided by kasserver.com based on nameservers. Performance is moderate with no evident broken elements. SEO is basic with meta tags present but could be improved with structured data and Open Graph tags. No analytics or tracking scripts were detected in the provided content, indicating a privacy-conscious approach or limited tracking. Technical risks include missing security headers and lack of formal security documentation, which could impact business operations if exploited.
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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