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Security report for holidu.es

Holidu GmbH · Real Estate · Germany

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 and well-established vacation rental platform targeting European travelers seeking apartments, rural houses, and holiday rentals. The website offers a comprehensive selection of properties with features catering to families, pet owners, and various vacation preferences. Technically, the site employs modern JavaScript frameworks such as React and Tailwind CSS, integrates analytics and marketing tools like Google Analytics and Tag Manager, and demonstrates good performance and mobile optimization. Security posture is strong with HTTPS enforcement, security headers, and no visible vulnerabilities, though explicit security policies and incident response details are absent. Overall, the site is trustworthy, compliant with GDPR, and provides a positive user experience.

Scanned

This is an earlier scan of holidu.es. 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.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 holds a strong market position as a European vacation rental aggregator with a clear business model focused on connecting renters with property owners. The platform supports multiple languages and currencies, enhancing its appeal across diverse markets. Key services include property search, booking, and advertising for owners. The company benefits from trust signals such as star host badges and free cancellation policies. While direct contact information is not prominently displayed, the site maintains comprehensive privacy and cookie policies. The business targets families, pet owners, and leisure travelers, leveraging partnerships with advertising networks and retargeting services to drive growth.

Security posture

The website exhibits a mature security posture with enforced HTTPS, comprehensive security headers, and secure form handling. No exposed sensitive data or vulnerable libraries were detected. However, the absence of a published security policy, incident response plan, or vulnerability disclosure program limits transparency. No dedicated security contact channels were found. The use of third-party scripts and ad networks introduces some risk, but overall security practices align with industry standards. Enhancing incident response readiness and publishing security policies would improve trust and compliance.

Recommendations

  1. Publish a dedicated security policy and incident response plan on the website.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Provide clear security contact channels such as security@ or abuse@ email addresses.
  4. Regularly review and audit third-party scripts and ad networks for security risks.
  5. Enhance accessibility features to improve compliance and user experience.
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, Property advertising for owners, Multi-language and multi-currency support
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React, Tailwind CSS, ThumbmarkJS, Google Tag Manager, Google Analytics
Frameworks
React
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Secure forms with POST methods
  • Use of security headers
  • No known vulnerable libraries detected

Analytics and tracking

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

Advertising

Ad networks
Taboola, Bing Ads, Facebook Ads
Tracking pixels
Facebook Pixel
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 professionally designed and fully functional.
  2. Strong focus on vacation rental market in Europe.
  3. Good privacy and cookie compliance with user consent mechanisms.
  4. No direct contact emails or phone numbers found on main page; likely available on other pages.
  5. Use of modern web technologies and analytics tools.
  6. No security or content blocking detected.
  7. No explicit security or incident response policies published.
  8. High trust indicators such as star host badges and free cancellation policies.
Technical notes

Notes

The website is built on a modern tech stack including React and Tailwind CSS, ensuring responsive and performant user interfaces. It leverages asynchronous font loading and performance monitoring scripts to optimize load times. Integration with Google Analytics and Tag Manager supports data-driven marketing. The site uses secure HTTPS connections and applies security headers effectively. No CMS was explicitly detected, suggesting a custom or proprietary platform. Hosting provider details are not disclosed. Overall, the technical infrastructure supports a fast, accessible, and SEO-optimized website with room for further security transparency.
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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