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Security report for vierwende.de

co2online gGmbH (implied parent) · Energy · Germany

Medium risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

71/100

Risk levelMedium

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

VierWende is a German community platform dedicated to supporting homeowners in successfully modernizing their homes with a focus on climate protection. It offers a range of services including community forums, expert webinars, group energy consulting, mentoring, and practical guides. The platform is affiliated with co2online, a reputable non-profit climate protection organization with two decades of experience. The website is well designed, mobile optimized, and uses modern technologies such as React, Font Awesome, and Mapbox, hosted on Cloudfront CDN and powered by the Hivebrite community platform. Security posture is good with HTTPS and no visible vulnerabilities, but lacks explicit security headers and privacy/cookie policies. WHOIS data is minimal, reducing transparency but the business credibility is supported by the affiliation with co2online and the non-commercial, neutral stance. Overall, the site is trustworthy and professional, serving a niche market of environmentally conscious homeowners in Germany.

Scanned

NIS2 and GDPR posture

GDPR outside view
48/ 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

3 findings rated critical or high. Fix these first.

  1. GDPR outside view

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

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

  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

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

Keep watching vierwende.de

This scan found 22 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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  • 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
72
Security headers
80
Email security
60
DNS health
65
Network security
100
GDPR outside view
48
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

VierWende operates as a niche community platform targeting homeowners interested in energy-efficient renovations and climate-friendly home improvements. Its business model includes free membership with an optional paid Pro membership offering enhanced features such as live webinars and personalized mentoring. The platform leverages the reputation and expertise of co2online, enhancing its market position. The service ecosystem includes moderated forums, expert consultations, and educational content, positioning VierWende as a trusted resource in the German energy efficiency and home renovation sector. The lack of explicit company registration details in WHOIS is a minor concern but offset by the strong brand association and transparent mission. The platform's growth potential lies in expanding its community and paid membership base while maintaining neutrality and data protection.

Security posture

The website demonstrates a solid security foundation with enforced HTTPS, use of Google reCAPTCHA v2 to prevent automated abuse, and no exposed sensitive data in the HTML source. However, it lacks visible security headers such as Content Security Policy, HSTS, and X-Frame-Options, which are recommended best practices to enhance protection against common web attacks. There is no published incident response or vulnerability disclosure policy, which could improve transparency and trust. Privacy compliance is weak due to missing explicit privacy and cookie policies and no visible consent mechanisms, which is a compliance risk under GDPR. The WHOIS data is incomplete, reducing domain registration transparency. Overall, the security posture is good but could be improved with better header implementation and privacy disclosures.

Recommendations

  1. Publish comprehensive privacy and cookie policies with GDPR-compliant consent mechanisms.
  2. Implement and configure security headers such as CSP, HSTS, X-Frame-Options, and X-Content-Type-Options.
  3. Provide clear incident response and vulnerability disclosure information on the website.
  4. Add data protection officer contact details to enhance compliance transparency.
  5. Improve accessibility features to meet higher standards and enhance user experience.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
co2online gGmbH (implied parent)
Description
VierWende is a community platform for homeowners who want to modernize their homes successfully and protect the climate. It offers real user experiences, expert webinars, and step-by-step guides.
Key services
Community forums, Monthly expert webinars, Group energy consulting, Mentoring (Sanierungsmatch), Experience reports, Step-by-step renovation guides
Content quality
good
Branding
consistent

Technology

Stack
React (implied by JSX classnames and scripts), Font Awesome 6, Mapbox, Google reCAPTCHA v2, Stripe, PayPal, Amplitude Analytics, Datadog, Sentry, Hivebrite platform
Frameworks
Hivebrite (community platform)
Platforms
Cloudfront CDN, Hivebrite SaaS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA v2
  • No exposed sensitive data in HTML
  • No visible vulnerable libraries

Analytics and tracking

Services
Amplitude, Datadog, Sentry
Tracking level
moderate
Privacy practices
poor

Advertising

Tracking pixels
Amplitude, Datadog, Sentry
Marketing tools
Amplitude, Datadog, Sentry
Transparency
basic

Site quality

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

Key observations

  1. Website is a community platform for homeowners focused on energy-efficient renovation.
  2. Content is in German and targets German homeowners.
  3. No explicit privacy or cookie policies found on the main page.
  4. Uses modern web technologies and third-party services for analytics and community management.
  5. No signs of malicious or adult content.
  6. WHOIS data is minimal, reducing transparency.
  7. No visible security headers in HTML source.
  8. No explicit contact phone numbers or physical addresses found.
  9. Contact email provided in text as community(at)vierwende.de.
  10. Multiple calls to action for free registration and Pro membership upgrade.
Technical notes

Notes

The website is built on the Hivebrite community platform, utilizing modern front-end technologies including React and Font Awesome icons. It integrates multiple third-party services such as Mapbox for mapping, Google reCAPTCHA for bot protection, Stripe and PayPal for payments, and analytics tools like Amplitude, Datadog, and Sentry for monitoring and user behavior tracking. Hosting is via AWS Cloudfront CDN ensuring good global performance. The site is mobile optimized with responsive design and uses preconnect hints for performance optimization. However, the site lacks some SEO and accessibility enhancements and does not expose security headers, which are areas for technical improvement. Overall, the technical infrastructure is modern and robust but could benefit from additional security and compliance hardening.
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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