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Security report for holidu.de

Holidu GmbH · Hospitality · Germany

Medium risk. 5 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

75/100

Risk levelMedium

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

Holidu GmbH operates a professional online marketplace specializing in vacation rentals across Europe, offering a wide range of holiday homes, apartments, and specialized filters such as family-friendly and pet-friendly options. The company positions itself as a trusted specialist in European holiday accommodations, supported by strong branding and user trust signals like Trustpilot reviews and Star Host badges. The website is well-structured, mobile-optimized, and integrates multiple analytics and advertising platforms to enhance marketing and user insights. Security practices are solid with HTTPS enforcement and cookie consent mechanisms, though explicit security policies and incident response contacts are not publicly detailed. Overall, the site demonstrates a mature digital presence suitable for its market segment.

Scanned

This is an earlier scan of holidu.de. View the latest report

NIS2 and GDPR posture

GDPR outside view
33/ 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

5 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

    • 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

  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 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. 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 holidu.de

This scan found 16 issues across 5 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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
70
Email security
100
DNS health
70
Network security
100
GDPR outside view
33
Average
75

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

Holidu's market positioning as a European vacation rental specialist is reinforced by localized domains and multilingual support. The business model centers on aggregating and verifying rental properties, providing consumers with trusted booking options. Revenue likely derives from commissions or referral fees. The presence of Star Host badges and Trustpilot integration indicates a focus on quality assurance and customer trust. The company leverages partnerships across multiple country-specific domains, enhancing market reach. Growth indicators include extensive property listings and advanced filtering options catering to diverse customer needs.

Security posture

The website employs HTTPS with strong SSL configuration and includes standard security headers to protect users. Forms use POST methods for redirects, reducing risk of data leakage. Cookie consent is implemented in compliance with GDPR. However, the absence of a published security policy, incident response plan, or vulnerability disclosure program limits transparency. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The security posture is good but could be improved by publishing dedicated security documentation and implementing advanced headers like CSP.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Add explicit contact channels for security incidents (e.g., security@holidu.de).
  4. Enhance security headers with Content Security Policy (CSP) to mitigate XSS risks.
  5. Continue monitoring third-party scripts and update dependencies to avoid vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Riesige Auswahl an hochwertigen Ferienhäusern, Ferienwohnungen, Fincas ✔ Geprüfte Unterkünfte zum besten Preis mit Vertrauen buchen ✔ Ferienhäuser mit Pool, Meerblick, kinderfreundlich, haustierfreundlich ✔ Spezialist für die schönsten Urlaubsregionen Europas ✔
Key services
Vacation rental search and booking, Verified accommodations, Filters for family-friendly, pet-friendly, pool, sea view, etc.
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Analytics, Google Tag Manager, Bing Ads, Taboola, AWS DNS hosting
Frameworks
React
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Secure forms with POST method for redirects
  • Cookie consent mechanism implemented

Analytics and tracking

Services
Google Analytics, Google Tag Manager, Bing Ads
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Bing Ads, Taboola, Facebook Ads
Tracking pixels
Bing Ads, Taboola
Marketing tools
Bing Ads, Taboola
Transparency
good

Site quality

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

Key observations

  1. Website is a professional vacation rental marketplace focused on European destinations.
  2. Strong branding and consistent user interface with multilingual support.
  3. Comprehensive cookie and privacy policies with consent mechanisms.
  4. Use of multiple third-party analytics and advertising platforms.
  5. No signs of security blocking or WAF challenges.
  6. No explicit contact emails or phone numbers found on the homepage HTML snippet.
  7. Star Host badges and Trustpilot integration enhance trust signals.
Technical notes

Notes

The website is built using modern JavaScript frameworks, likely React, with asynchronous loading of analytics and advertising scripts to optimize performance. Hosting is managed via AWS infrastructure, ensuring scalability and reliability. The site demonstrates excellent mobile responsiveness and accessibility features. SEO is well addressed with comprehensive meta tags, Open Graph data, and hreflang attributes for internationalization. The use of multiple preconnect hints and font loading strategies indicates attention to performance optimization. No major technical debt or outdated technologies were observed.
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

Earlier scans of this domain

  1. 74/100Medium26 findingsView report
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