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Security report for holidu.be

Holidu GmbH · Hospitality · Belgium

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

Security score

71/100

Risk levelMedium

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

Holidu GmbH operates a professional vacation rental marketplace focused on European destinations, offering a wide range of verified holiday homes, villas, and apartments. The website targets families, pet owners, and travelers seeking quality accommodations with specialized filters such as pools, views, and child-friendly options. The company maintains a strong market position with consistent branding and a comprehensive service offering including a mobile app. Technically, the website uses modern JavaScript frameworks, fingerprinting technology, and integrates multiple marketing and analytics tools, reflecting a mature digital infrastructure. Security posture is solid with HTTPS, security headers, and cookie consent mechanisms, although some additional headers could enhance protection. The domain WHOIS data is privacy protected, which is typical for this business type and does not raise suspicion. Overall, the website is professional, trustworthy, and compliant with GDPR requirements.

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.be

This scan found 19 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

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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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Full report

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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
72
Security headers
70
Email security
80
DNS health
70
Network security
100
GDPR outside view
33
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

Holidu's market positioning as a specialist in European vacation rentals is supported by its extensive network of regional partner sites and a strong brand presence. The business model centers on aggregating and verifying listings to provide trustworthy booking options. Revenue streams likely include commissions from bookings and partnerships with property owners. The target customer segments include families, pet owners, and vacationers seeking verified and quality accommodations. Growth indicators include a broad geographic reach and mobile app availability. The partnership ecosystem is robust with multiple country-specific domains. Operationally, the company demonstrates professionalism and a focus on user experience.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, presence of key security headers, and no visible vulnerabilities or exposed sensitive data. The use of cookie consent and privacy policies indicates compliance with GDPR. However, the absence of some recommended headers like CSP, HSTS, and X-Frame-Options suggests room for improvement. No incident response or security policy pages were found, which could be enhanced to improve transparency and readiness. Overall, the security maturity is good but could benefit from additional hardening measures.

Recommendations

  1. Implement Content Security Policy (CSP) header to mitigate XSS risks.
  2. Add Strict-Transport-Security (HSTS) header to enforce HTTPS usage.
  3. Include X-Frame-Options header to prevent clickjacking attacks.
  4. Publish a dedicated security policy and incident response information.
  5. Enhance transparency by providing direct contact information for security and support.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Large choix de locations et maisons de vacances, villas de qualité ✔ Logements vérifiés au meilleur prix à réserver en toute confiance ✔ Logements avec piscine, vue sur la mer, adaptés aux enfants et aux animaux ✔ Spécialiste des plus belles régions de vacances en Europe ✔
Key services
Vacation home search and booking, Verified listings, Mobile app for booking, Specialized filters (family-friendly, pet-friendly, views, pools)
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, ThumbmarkJS fingerprinting, Google Tag Manager, Taboola, Bing Ads, Facebook Connect, CDN (jsdelivr, holidu.com assets)
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
  • No exposed sensitive data in HTML
  • Use of security headers
  • Cookie consent mechanism

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 fully accessible with rich content and interactive features.
  2. Strong focus on vacation rental marketplace with family and pet-friendly options.
  3. Comprehensive cookie and privacy policies with consent mechanisms.
  4. No direct contact emails or phone numbers found on the main page.
  5. Use of modern JavaScript frameworks and tracking technologies.
  6. No security challenges or WAF blocks detected.
  7. WHOIS data is privacy protected with no public registrant info.
  8. High quality and professional design and content.
Technical notes

Notes

The website is built on a modern JavaScript stack, likely React, with asynchronous loading of fonts and scripts to optimize performance. It integrates multiple third-party services for analytics, marketing, and tracking, including Google Analytics, Tag Manager, Taboola, Bing Ads, and Facebook Connect. The site is mobile-optimized with responsive design and accessibility considerations. Performance is moderate, with some heavy SVG and image usage. The domain uses privacy protection in WHOIS, which is common and justified. No CMS was explicitly detected. Hosting provider details are not disclosed. Overall, the technical infrastructure supports a scalable and user-friendly platform.
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. 72/100Medium26 findingsView report
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