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Security report for holidu.se

Holidu GmbH · Hospitality · Sweden

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 comprehensive vacation rental platform specializing in high-quality holiday homes, apartments, villas, and cottages primarily targeting European consumers. The website offers a rich user experience with extensive filtering options for amenities such as pools, sea views, pet-friendliness, and family suitability. The company positions itself as a trusted specialist in vacation rentals with a strong market presence across multiple European countries. Technically, the site leverages modern web technologies including React and Tailwind CSS, with integrations for analytics and advertising through Google Analytics, Tag Manager, Taboola, Bing Ads, and Facebook Connect. Security posture is solid with HTTPS enforced and standard security headers present, though explicit security policies and incident response information are not publicly disclosed. Privacy compliance is well addressed with clear privacy and cookie policies and consent mechanisms. The absence of WHOIS data for the exact domain queried introduces some uncertainty in domain legitimacy, but the overall digital footprint and branding indicate a reputable business. Strategic recommendations include publishing security and incident response policies, implementing security.txt, and enhancing CSP headers to further strengthen security.

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.se

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.

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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 GmbH operates a multi-regional vacation rental marketplace with sister sites targeting various European markets. The business model focuses on aggregating and verifying vacation rental listings, providing consumers with a trustworthy booking experience. Revenue streams likely include commissions on bookings and partnerships with property owners. The platform targets families, pet owners, and travelers seeking specialized amenities. The company demonstrates strong branding consistency and trust signals such as verified accommodations and star host badges. The partnership ecosystem includes multiple regional domains and advertising networks. Growth indicators include extensive content, mobile app availability, and comprehensive filtering options. The company maintains a professional online presence with good SEO and user experience, positioning it well in the competitive vacation rental industry.

Security posture

The website exhibits a mature security posture with HTTPS enforced and multiple security headers configured to protect user data and privacy. Forms use secure POST methods for redirects, and cookie consent mechanisms are implemented to comply with GDPR. However, the absence of publicly available security policies, incident response plans, and vulnerability disclosure mechanisms limits transparency. No vulnerabilities or exposed sensitive data were detected in the HTML content. The use of third-party scripts for analytics and advertising is extensive but standard for the industry. Recommendations include publishing a security.txt file, incident response information, and enhancing HTTP security headers such as Content Security Policy (CSP) to mitigate risks from third-party scripts. Overall, the security posture is good but could be improved with greater transparency and advanced header configurations.

Recommendations

  1. Publish a security.txt file and vulnerability disclosure policy to facilitate responsible reporting.
  2. Make incident response and security policies publicly accessible to enhance transparency and trust.
  3. Implement Content Security Policy (CSP) headers to reduce risks from third-party scripts and cross-site scripting.
  4. Regularly audit and update third-party libraries and scripts to mitigate potential vulnerabilities.
  5. Enhance contact information visibility to improve business credibility and customer trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Stort urval av högkvalitativa semesterhus i hyra lägenheter ✔ Kontrollerat boende till bästa pris, boka med tillförsikt ✔ Semesterboende med pool, havsutsikt, barnvänligt, husdjursvänligt ✔ Specialist på de vackraste semesterregionerna ✔
Key services
Vacation rental search and booking, Verified accommodations, Filters for amenities like pool, sea view, pet-friendly, family-friendly
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React, Tailwind CSS, ThumbmarkJS, Google Analytics, Google Tag Manager, Taboola, Bing Ads, Facebook Connect
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 method for redirects
  • Cookie consent mechanism implemented

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
Taboola, 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. No WHOIS data found for the exact domain queried, possibly due to querying subdomain
  3. Strong privacy and cookie policies with consent mechanisms present
  4. No explicit contact emails or phone numbers found in the HTML content
  5. Multiple external trusted domains and partner sites linked
  6. Use of modern web technologies and frameworks
  7. Good SEO and accessibility practices observed
  8. No adult or NSFW content detected
  9. Advertising and tracking scripts are present but transparent
  10. No explicit security or incident response policies publicly found
Technical notes

Notes

The website is built on a modern technology stack featuring React and Tailwind CSS, ensuring responsive and performant user experiences across devices. It integrates multiple analytics and advertising platforms, including Google Analytics, Tag Manager, Taboola, Bing Ads, and Facebook Connect, enabling comprehensive marketing and user behavior tracking. The site employs asynchronous script loading and font loading optimizations to improve performance. SEO is well addressed with appropriate meta tags, Open Graph data, and hreflang attributes for internationalization. Accessibility features are present but could be further enhanced. Hosting details are not explicitly identified from the HTML content. Overall, the technical infrastructure supports a scalable and user-friendly platform with opportunities for further security enhancements.
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. 68/100Medium27 findingsView report
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