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Security report for tomas.travel

Holidu GmbH · Hospitality · Germany

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

Security score

72/100

Risk levelMedium

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

Holidu GmbH operates a vacation rental search and booking platform targeting travelers seeking holiday accommodations primarily in Germany and Europe. The website offers a comprehensive search engine with over 15 million listings, positioning itself as a significant player in the hospitality sector. The business model revolves around aggregating and comparing vacation rental offers to facilitate user bookings. Technically, the site employs modern JavaScript frameworks, including React, and integrates multiple analytics and marketing tools such as Google Analytics, Bing Ads, and Taboola. Hosting is managed via Amazon AWS infrastructure, ensuring reliable performance and scalability. Security posture is solid with HTTPS enforcement and standard security headers, though explicit security policies and incident response contacts are not published on the analyzed page. Privacy compliance is evident through accessible privacy and cookie policies, with GDPR considerations addressed. Overall, the site demonstrates good professionalism, trustworthiness, and technical maturity, though improvements in transparency around security and contact information would enhance credibility further.

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 tomas.travel

This scan found 18 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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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
74
Security headers
70
Email security
87
DNS health
70
Network security
100
GDPR outside view
33
Average
72

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 in the European vacation rental industry, leveraging a large inventory and price comparison capabilities to attract travelers. The company benefits from partnerships and a visible social media presence, enhancing brand recognition. Revenue streams likely include commissions from bookings and advertising partnerships. The target audience is broad, encompassing leisure travelers and vacation renters. The platform's technical infrastructure supports extensive data collection and user tracking for marketing optimization. Growth indicators include active experimentation with UI/UX features and integration of multiple tracking and advertising services. The partnership ecosystem includes major social media platforms and advertising networks, though no direct partner domains were identified in the analyzed content.

Security posture

The website maintains a good security baseline with HTTPS, no exposed sensitive data, and use of security headers such as cache control and referrer policies. However, the absence of a published security policy, incident response contacts, or vulnerability disclosure mechanisms limits transparency and preparedness perception. The use of third-party tracking and fingerprinting scripts introduces privacy considerations but appears compliant with GDPR through cookie consent mechanisms. No vulnerabilities or malware indicators were detected. Recommendations include publishing a security.txt file, enhancing CSP headers, and providing clear incident response channels to improve security maturity and user trust.

Recommendations

  1. Publish a dedicated security policy and incident response contact information on the website.
  2. Implement and publicize a security.txt file to facilitate vulnerability disclosures.
  3. Enhance Content Security Policy (CSP) headers to mitigate risks from third-party scripts.
  4. Improve accessibility features to meet higher standards and broaden user inclusivity.
  5. Expand SEO metadata and structured data to improve search engine visibility and indexing.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Holidu is a vacation rental search platform that helps users find and compare over 15 million holiday offers. It targets travelers looking for accommodations and vacation homes.
Key services
Vacation rental search, Price comparison, Booking facilitation
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Google Analytics, Google Tag Manager, Bing Ads (bat.bing.com), ThumbmarkJS fingerprinting, AWS DNS hosting
Frameworks
React
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of async scripts
  • No inline event handlers

Analytics and tracking

Services
Google Analytics, Bing Ads, Taboola
Tracking level
extensive
Privacy practices
basic

Advertising

Ad networks
Bing Ads, Taboola
Tracking pixels
Bing Ads, Taboola, Facebook Connect
Marketing tools
ThumbmarkJS
Transparency
good

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is a 404 error page for the /dmo path but contains full site header, footer, and search functionality.
  2. No direct contact emails or phone numbers found on this page.
  3. Strong use of modern JavaScript frameworks and analytics tools.
  4. Legal links (Impressum, Datenschutz, AGB) are present and accessible.
  5. No signs of malware, phishing, or suspicious content.
  6. Social media presence on Instagram, LinkedIn, Facebook is linked in footer.
  7. No explicit security or incident response policies found on this page.
Technical notes

Notes

The website is built on a modern JavaScript stack, likely React, with asynchronous loading of analytics and marketing scripts to optimize performance. Hosting on AWS provides scalability and reliability. The site includes preconnect hints and font loading optimizations for better user experience. Performance is moderate with room for improvement in SEO and accessibility. The presence of multiple tracking and advertising scripts indicates a mature marketing infrastructure but requires careful privacy management. No CMS was explicitly detected, suggesting a custom or proprietary platform. The site is mobile-optimized and includes basic accessibility features but could benefit from further 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

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