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Security report for hotel.cz

ONLINE HOLDING s.r.o. · Hospitality · Czech Republic

Medium risk. 5 critical or high findings in Security headers, Email security and 1 other check.

Security score

71/100

Risk levelMedium

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

Hotel.cz is an established online hotel booking platform primarily serving the Czech Republic and Slovakia markets. Operated by ONLINE HOLDING s.r.o., it offers a wide selection of hotels and accommodation options with a focus on competitive pricing and direct hotel payments. The website positions itself as a market leader with over 10 years of experience, targeting travelers seeking convenient and reliable hotel reservations. The platform provides multilingual support and extensive filtering options to enhance user experience. Technically, the website employs modern tracking and analytics tools including Google Analytics, Microsoft Clarity, Bing UET, and OneTrust for cookie consent management, indicating a mature digital infrastructure. The site is mobile-optimized and features a responsive design, although accessibility features are basic. Performance is moderate with room for improvement in security header implementation. From a security perspective, the site uses HTTPS and cookie consent mechanisms, but lacks visible security policies, incident response contacts, or vulnerability disclosure information. The absence of WHOIS data for the domain is a notable concern, limiting the ability to fully verify domain legitimacy and ownership. No critical vulnerabilities or exposed sensitive data were detected in the content. Overall, Hotel.cz presents a professional and trustworthy front for hotel bookings, but would benefit from enhanced transparency in privacy and security policies, as well as domain registration clarity to strengthen trust and compliance posture.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
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. 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • 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';…

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

  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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching hotel.cz

This scan found 20 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
  • Email delivery with an unlock code
  • Lifetime access to this report

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
75
Security headers
20
Email security
65
DNS health
80
Network security
100
GDPR outside view
88
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

Hotel.cz operates in the hospitality sector as an essential business entity providing online hotel booking services. Its competitive advantage lies in its extensive hotel network, user-friendly search and booking interface, and market leadership in the Czech Republic. The business model revolves around facilitating direct hotel reservations with guaranteed best prices and no hidden fees. Revenue streams likely include commissions from hotel bookings and partnerships with accommodation providers. The target customer segment includes domestic and international travelers seeking accommodation in Czech and Slovak regions. The company maintains a broad partnership ecosystem with numerous hotel partners, enhancing its market presence and service offerings. Growth indicators include multilingual support and a large inventory of hotels and packages. Strategic observations suggest opportunities to improve trust signals by publishing detailed privacy and security policies and clarifying domain registration information.

Security posture

The current security maturity level of Hotel.cz is moderate. The website enforces HTTPS and implements cookie consent via OneTrust, demonstrating compliance with basic privacy regulations such as GDPR. However, the absence of security headers like Content-Security-Policy or X-Frame-Options reduces protection against common web attacks. No security.txt or vulnerability disclosure mechanisms are present, limiting transparency and incident response readiness. The lack of published security policies and incident response contacts indicates gaps in security culture and communication. No exposed sensitive data or vulnerable libraries were detected, which is positive. To enhance security posture, the company should implement additional HTTP security headers, publish clear security and privacy policies, and establish formal vulnerability disclosure and incident response procedures. These steps will improve compliance with GDPR and NIS2 directives and strengthen overall security culture.

Recommendations

  1. Implement comprehensive HTTP security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web vulnerabilities.
  2. Publish a detailed privacy policy and terms of service prominently on the website to improve transparency and GDPR compliance.
  3. Establish and publish a vulnerability disclosure policy and security.txt file to facilitate responsible reporting and incident management.
  4. Clarify domain registration details and ensure WHOIS information is complete and publicly accessible to enhance domain legitimacy and trust.
  5. Enhance accessibility features to meet recognized standards and improve user experience for all visitors.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ONLINE HOLDING s.r.o.
Description
Největší výběr hotelů a ubytování v Praze a celé ČR. Rezervujte si hotel online za nejnižší ceny. Nejlepší ceny, žádné další poplatky, plaťte přímo na hotelu. Garance stejné nebo nižší ceny. Hotel.cz – vynikající služby a jednička na trhu po více než 10 let.
Key services
Hotel reservations, Accommodation listings, Online booking
Content quality
good
Branding
consistent

Technology

Stack
Google Tag Manager, Google Analytics, Microsoft Clarity, OneTrust Cookie Consent, Bing UET, Swiper.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent implemented

Analytics and tracking

Services
Google Analytics, Microsoft Clarity, Bing UET
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
Bing Ads
Tracking pixels
Microsoft Clarity, Bing UET
Transparency
good

Site quality

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

Key observations

  1. Website is a professional hotel booking platform focused on Czech Republic and Slovakia.
  2. Content is rich with hotel listings, search forms, and partner hotel links.
  3. No WHOIS data available, which is a concern for domain legitimacy verification.
  4. Cookie consent is implemented using OneTrust, indicating GDPR awareness.
  5. No explicit privacy policy or terms of service found in the provided content.
  6. No security.txt or vulnerability disclosure information found.
  7. No contact emails found; only a company phone number is provided.
  8. Multiple external analytics and tracking services are used.
  9. No WAF or blocking mechanisms detected; site is fully accessible.
  10. No adult or explicit content detected; content is safe for general audiences.
Technical notes

Notes

The website uses a modern technology stack with integration of Google Tag Manager, Google Analytics, Microsoft Clarity, Bing UET, and OneTrust for cookie management. The front-end is responsive and mobile-optimized, providing a good user experience across devices. Performance is moderate, with potential improvements in load times and resource optimization. The site lacks a detected CMS, suggesting a custom or proprietary platform. Hosting provider details are not evident from the content. SEO optimization is good with proper meta tags and Open Graph data, although JSON-LD structured data is empty. Technical debt indicators are minimal but the absence of security headers and WHOIS data represent risks. Modernization opportunities include adding structured data for rich snippets, improving accessibility, and enhancing security configurations to reduce technical risks impacting business operations.
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. 71/100Medium29 findingsView report
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