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Security report for sixt.cz

Sixt · Transportation · Czech Republic

High risk. 8 critical or high findings in GDPR outside view, Security headers and 2 other checks.

Security score

46/100

Risk levelHigh

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

Sixt.cz is a well-established car rental and leasing service provider in the Czech Republic, offering a wide range of mobility solutions including car rentals, operational leasing, used car sales, limousine services, and motorbike rentals. The company targets both individual and corporate clients with a strong presence in major Czech cities such as Prague, Brno, and Ostrava. Sixt positions itself as the largest and best-rated car rental company in the country with a global footprint through its parent company Sixt SE. Technically, the website employs modern web technologies including jQuery, Slick Slider, Google Tag Manager, and analytics tools such as Google Analytics, Hotjar, and Smartlook. The site is mobile optimized, well-structured, and includes cookie consent mechanisms compliant with GDPR. Performance is moderate with good SEO and accessibility practices. From a security perspective, the site enforces HTTPS and uses cookie consent for tracking scripts. However, no explicit security policy or incident response information is published, and WHOIS data for the domain is unavailable, which slightly reduces trustworthiness. No critical vulnerabilities or exposed sensitive data were detected. Overall, Sixt.cz presents a professional, trustworthy, and comprehensive digital presence for its business. Strategic recommendations include publishing a security policy, improving security headers, and adding vulnerability disclosure information to enhance transparency and trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
40/ 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

8 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 Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

  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 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';…

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

Keep watching sixt.cz

This scan found 24 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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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
57
Security headers
15
Email security
70
DNS health
75
Network security
20
GDPR outside view
40
Average
46

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 sixt.cz, from OffSeq Breach.

No leaked records found

Breach holds no records for sixt.cz 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

Sixt.cz operates in the transportation sector focusing on car rental and leasing services. It leverages its long-standing brand reputation and international backing from Sixt SE to maintain a strong market position in the Czech Republic. The business model includes direct consumer rentals, corporate leasing, and vehicle sales, supported by a network of physical branches and digital platforms. Revenue streams are diversified across short-term rentals, long-term leasing, and value-added services like limousine transfers. The company targets a broad customer base from individual travelers to corporate fleets. Partnerships with Sixtleasing.cz and integration with global Sixt platforms enhance service offerings and market reach. Growth indicators include extensive service variety, digital maturity, and strong brand recognition. The company maintains a robust marketing ecosystem with advanced analytics and retargeting capabilities.

Security posture

The security posture of Sixt.cz is solid with mandatory HTTPS enforced and cookie consent mechanisms in place to comply with privacy regulations. The site uses reputable analytics and tracking services with user consent. However, the absence of published security policies, incident response contacts, and vulnerability disclosure reduces transparency and preparedness perception. No visible security headers were confirmed in the HTML, which could be improved to mitigate common web threats. The WHOIS data is missing, which is a concern for domain legitimacy verification. Overall, the site demonstrates good baseline security practices but would benefit from enhanced security documentation and header implementation to improve trust and resilience.

Recommendations

  1. Publish a comprehensive security policy and incident response contact information on the website.
  2. Implement and verify security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection.
  3. Add a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  4. Regularly audit and update third-party scripts to minimize risk from external dependencies.
  5. Enhance accessibility features to improve compliance and user experience for all visitors.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sixt
Description
Sixt offers car rental, leasing, used car sales, limousine services, and motorbike rentals in the Czech Republic with branches in Prague, Brno, and Ostrava. They provide flexible mobility solutions for individuals and corporate clients including operational leasing and fleet management.
Key services
car rental, operational leasing, used car sales, limousine service, motorbike rental
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery, Slick Slider, Google Tag Manager, Google Analytics, Hotjar, Smartlook, CookieConsent
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data in HTML
  • Use of analytics scripts with consent

Analytics and tracking

Services
Google Analytics, Hotjar, Smartlook, Matomo (Piwik)
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Google Ads, Seznam Retargeting
Tracking pixels
Hotjar, Smartlook, Leady
Marketing tools
Hotjar, Smartlook, Leady
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed with comprehensive service offerings.
  2. Strong presence of analytics and marketing tools with proper consent mechanisms.
  3. No WHOIS data available, limiting domain trust verification.
  4. No visible security policy or incident response information published.
  5. Cookie consent and privacy policy are well implemented and accessible.
  6. Multiple external links to official Sixt domains and social media.
  7. No adult or questionable content detected.
  8. Good SEO and accessibility practices observed.
  9. Use of modern JavaScript libraries and tracking technologies.
Technical notes

Notes

The website uses a modern and widely supported technology stack including jQuery and Slick Slider for UI components, Google Tag Manager for analytics management, and multiple tracking tools like Hotjar and Smartlook for user behavior analysis. The site is mobile responsive and optimized for SEO with proper meta tags and Open Graph data. Performance is moderate, with asynchronous loading of scripts and preloading of fonts. The site lacks explicit CMS identification but appears custom-built or heavily customized. Hosting provider details are not disclosed. Technical debt is minimal, but improvements in accessibility and security headers could be addressed. Overall, the technical infrastructure supports a professional and scalable online presence.
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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