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Security report for gruppenhaus.de

Klaus Ludwig Verlag · Hospitality · Germany

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

Security score

59/100

Risk levelMedium

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

Gruppenhaus.de is a well-established German online platform specializing in group accommodations such as seminar houses, youth hostels, and meeting venues. With over 30 years of market presence and a large inventory of more than 3,700 properties, it serves groups planning seminars, school trips, music rehearsals, and family gatherings. The platform emphasizes direct booking inquiries without commission, positioning itself as a trusted intermediary in the hospitality sector focused on group travel within Germany and Europe. The business is operated by Klaus Ludwig Verlag, with a clear German address and phone contact, reinforcing its legitimacy and local market focus. Technically, the website employs modern web technologies including HTML5, CSS3, JavaScript, jQuery, and Leaflet for interactive maps. The site is mobile-optimized and provides a good user experience with clear navigation and relevant content. However, it lacks some advanced security headers and a cookie consent mechanism, which are important for GDPR compliance and enhanced security posture. The site enforces HTTPS with HSTS, indicating a good baseline for secure communications. From a security perspective, the site shows a moderate maturity level with no visible vulnerabilities or exposed sensitive data. The absence of certain security headers and cookie consent reduces the overall security and privacy compliance score. No incident response or vulnerability disclosure information is present, which could be improved to enhance trust and readiness. The WHOIS data aligns well with the business claims, showing consistent registration details and domain age appropriate for the company's history. Overall, gruppenhaus.de presents a professional and trustworthy online presence with solid business credibility and technical implementation. Strategic improvements in security headers, privacy compliance, and incident response transparency would further strengthen its security posture and regulatory adherence.

Scanned

NIS2 and GDPR posture

GDPR outside view
28/ 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. 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. 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';…

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Keep watching gruppenhaus.de

This scan found 26 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
77
Security headers
20
Email security
70
DNS health
60
Network security
100
GDPR outside view
28
Average
59

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 gruppenhaus.de, from OffSeq Breach.

Total records
13
Employees
0
Customers
13
Third parties
0
Weak passwords
69%

2 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for gruppenhaus.de.

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Technical appendix

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

Business context

Business profile

Gruppenhaus.de holds a strong market position as a leading portal for group travel accommodations in Germany, leveraging over three decades of experience. Its business model focuses on providing a comprehensive listing of group houses and seminar venues with direct booking inquiries, avoiding commission fees. This approach appeals to groups seeking cost-effective and straightforward booking processes. The platform targets educational groups, music ensembles, families, and seminar organizers, indicating a diverse customer base. The presence of thousands of verified reviews enhances trust and decision-making for users. The company operates under Klaus Ludwig Verlag, suggesting a stable organizational structure. No evident partnerships or subsidiaries were identified from the data, indicating a focused business scope. The website's content and navigation support growth through regional and thematic searches, facilitating user engagement and conversion.

Security posture

The website demonstrates a good security baseline with enforced HTTPS and HSTS headers, ensuring encrypted communication and protection against protocol downgrade attacks. However, the absence of critical security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection indicates potential exposure to cross-site scripting and clickjacking attacks. The login forms use password fields but lack visible multi-factor authentication or advanced security controls. No incident response or abuse contact information is provided, which limits transparency and preparedness for security events. The site does not display a vulnerability disclosure policy or security.txt file, which are best practices for responsible vulnerability management. Overall, the security posture is moderate but can be significantly improved by implementing missing headers, establishing incident response contacts, and enhancing privacy compliance mechanisms.

Recommendations

  1. Implement a Content-Security-Policy (CSP) header to mitigate cross-site scripting risks.
  2. Add X-Frame-Options header to prevent clickjacking attacks.
  3. Introduce a cookie consent banner/mechanism to comply with GDPR requirements.
  4. Publish incident response and abuse contact information to improve transparency and readiness.
  5. Consider adding a vulnerability disclosure policy or security.txt file to encourage responsible reporting.

Contact details published on the site

Addresses
Legal name
Klaus Ludwig Verlag
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Klaus Ludwig Verlag
Description
4347 Gruppenhäuser und Seminarhäuser in Deutschland! Finden Sie Gruppenunterkünfte für Ihre Gruppenreisen. Seminarhäuser, Schullandheime, Jugendherbergen, Tagungshäuser und mehr.
Key services
Listing of group houses and seminar houses, Direct booking inquiries without commission, Search by region, type, and activity
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, jQuery, Leaflet (mapping library), MobileDetect.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced with HSTS
  • No exposed sensitive data in HTML
  • Secure login forms with password fields

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

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 no blocking or WAF challenges.
  2. Content is in German and targeted at group travel accommodations in Germany and Europe.
  3. Strong business presence with over 30 years in the market.
  4. No social media links detected in the HTML content.
  5. No explicit cookie consent mechanism found despite GDPR relevance.
  6. Security headers partially implemented; room for improvement.
  7. Forms include login forms for premium users and house owners with password fields.
  8. No email addresses explicitly found in the HTML content.
  9. Phone number provided in JSON-LD structured data.
  10. Multiple internal links to sitemap, contact, privacy, and terms pages.
Technical notes

Notes

The website uses a custom or unknown CMS with a technology stack including HTML5, CSS3, JavaScript, jQuery, and Leaflet for interactive maps. It is mobile-optimized and provides a responsive design with good navigation clarity. Performance is moderate, with no explicit indicators of slow loading but also no advanced performance optimizations detected. Accessibility features are basic, with some attention to form input focus states and mobile device detection. SEO is supported by meta tags, keywords, and structured data in JSON-LD format. The site lacks modern security headers and cookie consent mechanisms, which are technical debts that should be addressed. Hosting provider details are not explicitly available, limiting infrastructure assessment. Overall, the technical implementation is solid but could benefit from modernization in security and privacy features.
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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