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Security report for holidu.pl

Holidu GmbH · Hospitality · Poland

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 online vacation rental marketplace specializing in high-quality holiday homes, apartments, villas, and cottages primarily across Europe. The website offers extensive filtering options for family-friendly, pet-friendly, and special amenities, targeting consumers seeking reliable and affordable vacation accommodations. The company maintains a strong market position as a specialist in European vacation rentals with multiple country-specific domains and a consistent brand presence. Technically, the website employs modern web technologies including React, Tailwind CSS, and integrates major analytics and advertising platforms such as Google Analytics, Bing Ads, and Taboola. The site is well-optimized for performance, mobile responsiveness, and SEO. Security posture is strong with HTTPS enforcement, security headers, and no visible vulnerabilities. Privacy compliance is robust with clear privacy and cookie policies and consent mechanisms. However, no direct contact emails or phone numbers were found, and WHOIS data is not publicly available, which is typical for privacy-protected European domains. Overall, the website presents a trustworthy and professional digital presence with a low risk profile.

Scanned

This is an earlier scan of holidu.pl. 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.pl

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

  • The complete analysis as a PDF you can cite
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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's business model centers on providing a comprehensive vacation rental search and booking platform, aggregating listings with detailed filters and high user ratings. The company targets families, pet owners, and travelers seeking specialized accommodations, leveraging a broad partnership ecosystem across multiple European countries. Revenue streams likely include commissions from bookings and advertising partnerships. The website's multilingual and multi-country structure indicates a mature market approach with localized offerings. The presence of 'featured hosts' and trust badges enhances credibility and user confidence. The company appears to be large in scale, supported by a sophisticated technical infrastructure and extensive marketing efforts.

Security posture

The website demonstrates a mature security posture with HTTPS enforced site-wide, presence of key security headers such as HSTS, X-Frame-Options, and Content-Security-Policy, and no exposed sensitive data in the HTML. The use of secure forms and POST methods for data submission is observed. Third-party scripts for analytics and advertising are present but are standard for the industry. No incident response or security contact information was found, which could be improved. GDPR compliance is evident through privacy and cookie policies with consent mechanisms. No vulnerabilities or security misconfigurations were detected in the provided content. Overall, the security maturity is high with room for enhanced transparency on incident response.

Recommendations

  1. Implement and publicly disclose a dedicated security incident response contact or page.
  2. Regularly audit and update third-party scripts to mitigate supply chain risks.
  3. Enhance CSP with reporting to monitor and respond to policy violations.
  4. Provide clearer business contact information to improve user trust and compliance.
  5. Maintain ongoing privacy compliance reviews aligned with evolving regulations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Ogromny wybór wysokiej jakości domów letniskowych, mieszkań wakacyjnych i willi. Sprawdzone zakwaterowanie w najlepszej cenie, zarezerwuj bez obaw. Domy wakacyjne z basenem, widokiem na morze, przyjazne dzieciom, przyjazne zwierzętom. Specjalista od najpiękniejszych regionów wakacyjnych w Europie.
Key services
Vacation home and apartment rentals, Search and booking platform, Filters for family-friendly, pet-friendly, and special amenities
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Tailwind CSS, Google Analytics, Google Tag Manager, Bing Ads, Taboola, ThumbmarkJS fingerprinting
Frameworks
React
Platforms
Web
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 methods
  • Use of security headers

Analytics and tracking

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

Advertising

Ad networks
Bing Ads, Taboola
Tracking pixels
Bing Ads, 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 no blocking detected
  2. Strong focus on vacation rental services in Europe with multiple language and country versions
  3. Comprehensive privacy and cookie policies with consent mechanisms
  4. Use of modern web technologies and analytics/tracking tools
  5. No direct contact emails or phone numbers found in the HTML content
  6. No explicit security or incident response contact information found
  7. No visible vulnerabilities or security misconfigurations in the analyzed content
Technical notes

Notes

The website is built on a modern JavaScript framework (likely React) with Tailwind CSS for styling, ensuring responsive and performant user experience. It leverages major analytics and advertising platforms for marketing and user insights. The site uses preconnect and preload hints to optimize resource loading. The HTML structure is semantic and includes accessibility considerations. No CMS is explicitly detected, suggesting a custom or headless architecture. Hosting provider details are not visible. Performance indicators suggest fast loading and good mobile optimization. The technical stack and implementation reflect a mature and well-maintained digital platform suitable for a large-scale e-commerce business in the hospitality sector.
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. 73/100Medium25 findingsView report
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