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Security report for holidu.es

Holidu GmbH · Real Estate · Spain

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

Security score

74/100

Risk levelMedium

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

Holidu GmbH operates a professional vacation rental platform focused on offering a wide range of holiday homes, including apartments, rural houses, and pet-friendly accommodations across Europe. The website targets families and travelers seeking verified vacation rentals with features such as pools, sea views, and child-friendly options. The platform supports multiple languages and countries, indicating a mature and expansive market presence. Technically, the site employs modern web technologies including React, Tailwind CSS, and integrates various analytics and marketing tools such as Google Analytics, Google Tag Manager, Taboola, and Facebook Connect. The site is mobile-optimized and provides a seamless user experience with clear navigation and professional design. Security-wise, the site enforces HTTPS, uses security headers, and implements cookie consent mechanisms, although explicit security policies and incident response contacts are not publicly available. WHOIS data confirms the legitimacy of the domain and its alignment with the business entity Holidu GmbH. Overall, the site demonstrates a strong digital maturity and trustworthy business model, with recommendations to enhance transparency around security policies and incident response.

Scanned

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.es

This scan found 16 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

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
80
DNS health
85
Network security
100
GDPR outside view
33
Average
74

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 GmbH is positioned as a key player in the European vacation rental market, leveraging a marketplace model that aggregates verified listings from various property owners. The business benefits from a broad geographic footprint with localized sites for many European countries, enhancing its competitive advantage. Revenue streams likely include commissions on bookings and advertising from property owners. The platform's focus on family and pet-friendly rentals caters to niche customer segments, increasing market appeal. Partnerships with major ad networks and tracking services support effective marketing and customer acquisition. The absence of direct contact information on the main site suggests a focus on automated online transactions. The company maintains consistent branding and trust signals such as verified listings and mobile app availability, supporting customer confidence.

Security posture

The website exhibits a solid security posture with mandatory HTTPS, comprehensive security headers, and cookie consent mechanisms aligned with GDPR requirements. The use of fingerprinting technology (ThumbmarkJS) indicates proactive fraud detection measures. However, the lack of publicly available security policies, incident response procedures, and vulnerability disclosure programs represents a gap in transparency and preparedness. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The site should consider publishing a security policy and providing clear channels for reporting security incidents to enhance trust and compliance. Regular audits of third-party scripts and dependencies are recommended to mitigate risks associated with external libraries.

Recommendations

  1. Publish a dedicated security policy page detailing security practices and compliance.
  2. Implement and publicize an incident response plan with clear contact channels for security issues.
  3. Introduce a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Enhance transparency on data retention and processing policies to strengthen GDPR compliance.
  5. Conduct regular security audits of third-party scripts and update dependencies to reduce vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Amplia selección de alquileres vacacionales, apartamentos, casas rurales de alta calidad. Alquileres vacacionales comprobados al mejor precio, reserva con confianza. Alquileres vacacionales con piscina, vistas al mar, apto para niños, apto para mascotas. Especialistas en las regiones turísticas más bonitas de Europa.
Key services
Vacation rental search and booking, Verified property listings, Mobile app for bookings, Property advertising for owners
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React, Tailwind CSS, ThumbmarkJS fingerprinting, Google Tag Manager, Google Analytics, Taboola, Bing Ads, Facebook Connect
Frameworks
React
Platforms
Web, Mobile app (iOS and Android)
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with opt-in
  • No exposed sensitive data in HTML
  • Use of fingerprinting for fraud detection

Analytics and tracking

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

Advertising

Ad networks
Taboola, Bing Ads, Facebook Ads
Tracking pixels
Facebook Connect
Marketing tools
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 platform targeting European markets.
  2. Strong focus on family and pet-friendly vacation rentals.
  3. Good implementation of privacy and cookie policies with consent mechanisms.
  4. Use of modern web technologies and tracking for analytics and marketing.
  5. No visible security or privacy red flags in content or WHOIS data.
  6. Lack of explicit security policy and incident response information.
  7. No visible contact emails or phone numbers on the main page.
  8. No terms of service page explicitly found.
Technical notes

Notes

The website is built using a modern JavaScript framework (React) with Tailwind CSS for styling, ensuring responsive and performant user interfaces. It leverages asynchronous font loading and preconnect hints to optimize performance. Integration with multiple analytics and marketing platforms supports data-driven decision making and targeted advertising. The site uses fingerprinting technology for enhanced user identification and fraud prevention. While the hosting provider is not explicitly identified, the use of CDN services and preconnects to major analytics and ad domains suggests a robust infrastructure. Performance is moderate with room for improvement in loading times. Accessibility features and SEO optimizations are well implemented, contributing to a positive user experience and search engine visibility.
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. 74/100Medium24 findingsView report
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