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Security report for holidu.gr

Holidu GmbH · Hospitality · Germany

Medium risk. 5 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

61/100

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 holiday homes, villas, and apartments. The website offers a comprehensive search and booking experience with a strong focus on family-friendly and pet-friendly accommodations. The company maintains a consistent brand presence across multiple country-specific domains and provides a mobile app for enhanced user accessibility. Technically, the site leverages modern web technologies including React and Tailwind CSS, ensuring fast performance and excellent mobile optimization. Security practices are solid with HTTPS enforcement, cookie consent mechanisms, and no visible vulnerabilities. However, explicit security policies and incident response contacts are not publicly available, which could be improved. Overall, the site is trustworthy, compliant with GDPR, and professionally managed.

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. 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.

    • Critical

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

  3. 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';…

Need hands-on remediation? Email guard@offseq.com

Keep watching holidu.gr

This scan found 13 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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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
0
Security headers
70
Email security
80
DNS health
85
Network security
100
GDPR outside view
33
Average
61

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 holidu.gr, from OffSeq Breach.

No leaked records found

Breach holds no records for holidu.gr right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

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 leading vacation rental marketplace in Europe, offering verified listings and a user-friendly platform. Its business model centers on aggregating vacation rental properties and facilitating bookings, generating revenue likely through commissions or referral fees. The company targets families, pet owners, and vacationers seeking quality accommodations with specific amenities. The presence of multiple localized domains indicates a broad market reach. Trust signals such as free cancellation, high user ratings, and verified hosts enhance its competitive advantage. The company appears mature with a large user base and a strong digital marketing ecosystem involving major ad networks and tracking tools.

Security posture

The website demonstrates a mature security posture with HTTPS, secure form handling, and cookie consent aligned with GDPR. Security headers are present but could be enhanced with additional controls like CSP and HSTS. No exposed sensitive data or vulnerable libraries were detected. The absence of a public security policy or vulnerability disclosure program suggests room for improvement in transparency and incident readiness. Overall, the security posture is good but could be elevated by publishing formal policies and providing dedicated security contacts.

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. Enhance HTTP security headers by adding Content Security Policy (CSP) and HTTP Strict Transport Security (HSTS).
  4. Provide clear company contact information including phone and email on the website for customer support and security reporting.
  5. Regularly audit third-party scripts and tracking tools to minimize security risks and improve privacy compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Τεράστια ποικιλία από υψηλής ποιότητας εξοχικά σπίτια, διαμερίσματα, villas. Ελεγμένα καταλύματα στην καλύτερη τιμή, κάντε κράτηση με σιγουριά. Διαμονή με πισίνα, θέα στη θάλασσα, φιλικό προς τα παιδιά, φιλική προς τα κατοικίδια. Ειδικός για τις πιο όμορφες περιοχές διακοπών στην Ευρώπη.
Key services
Vacation rental search and booking, Verified holiday homes and villas, Mobile app for booking, Accommodation listings with filters (pool, pet-friendly, child-friendly, views)
Content quality
excellent
Branding
consistent

Technology

Stack
React, JavaScript, Tailwind CSS, ThumbmarkJS fingerprinting, Google Analytics, Google Tag Manager
Frameworks
React
Platforms
Web, Mobile app (iOS and Android)
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
  • Cookie consent mechanism implemented

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Taboola, Bing Ads, Facebook Ads
Tracking pixels
Facebook Pixel, Bing UET
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 no blocking or WAF challenges.
  2. Content is professionally presented in Greek, targeting Greek and European vacationers.
  3. Strong focus on vacation rental listings with rich filtering options.
  4. Cookie consent and privacy policy are implemented and GDPR compliant.
  5. No explicit contact emails or phone numbers found on the homepage.
  6. Multiple external domains used for analytics, advertising, and content delivery.
  7. No visible security vulnerabilities or exposed sensitive data.
  8. No explicit terms of service or security policy pages found.
  9. No vulnerability disclosure or security.txt detected.
  10. Mobile and desktop versions are well optimized and performant.
Technical notes

Notes

The website uses a modern React-based frontend with Tailwind CSS for styling, ensuring responsive and performant user experience. It integrates third-party analytics and marketing tools such as Google Analytics, Google Tag Manager, Facebook Pixel, and Taboola for advertising and tracking. The site is well-structured with semantic HTML and optimized meta tags for SEO. Font loading is optimized asynchronously. No CMS was detected, indicating a custom-built platform. Hosting details are not explicit but performance indicators suggest a reliable infrastructure. Accessibility features are present but could be further enhanced with ARIA roles and landmarks.
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. 74/100Medium25 findingsView report
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