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Security report for decathlon.cz

Decathlon · Retail · Czech Republic

Medium risk. 7 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

68/100

Risk levelMedium

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

Decathlon.cz is the Czech Republic localized e-commerce and retail website of Decathlon, a major international sporting goods retailer. The site offers a wide range of sports equipment, apparel, and accessories for over 70 sports, targeting general consumers interested in sports and fitness. The business model includes direct sales, marketplace partner sales, product rental, buy-back programs, and a loyalty program, positioning Decathlon as a large player in the retail sports sector in the Czech market. Technically, the website is built on a custom platform with modern JavaScript frameworks and integrates multiple third-party services for privacy management, analytics, and payment processing. The site is well optimized for desktop and mobile, with good SEO and accessibility features. The use of HTTPS and security headers indicates a strong security posture, although explicit security policies and incident response information are not publicly detailed. Security-wise, the site demonstrates good practices including secure payment options and cookie consent mechanisms. No vulnerabilities or exposed sensitive data were detected in the analysis. However, the absence of WHOIS data limits domain registration transparency, though this is likely due to registry privacy policies rather than malicious intent. Overall, Decathlon.cz presents a professional, secure, and user-friendly online presence consistent with a large retail brand. Strategic recommendations include publishing explicit security and incident response policies, adding vulnerability disclosure information, and enhancing visible contact channels for security matters to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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

7 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

    • 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

    • High

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, LinkedIn, YouTube, Google APIs

      What to do: Document all third-party data sharing in your privacy policy

  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';…

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Keep watching decathlon.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.

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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
57
Security headers
65
Email security
85
DNS health
75
Network security
100
GDPR outside view
25
Average
68

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 decathlon.cz, from OffSeq Breach.

Total records
8,135
Employees
0
Customers
8,088
Third parties
47
Weak passwords
8%

9 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for decathlon.cz.

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Breach keeps ingesting new leaks, so these numbers can grow between scans.

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Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Decathlon.cz operates as a localized branch of the global Decathlon Group, focusing on the Czech market. It leverages a multi-channel retail approach combining online sales, physical stores, and marketplace partnerships. The company targets a broad demographic of sports enthusiasts and families, offering affordable and diverse sporting goods. Revenue streams include product sales, rentals, and loyalty-driven repeat purchases. The presence of sustainability initiatives such as second life and buy-back programs indicates a commitment to environmental responsibility. The partnership ecosystem includes payment providers like Klarna and Adyen, and marketing tools such as Adjust and Dynamic Yield, supporting a mature digital commerce operation. Growth indicators include frequent promotions, extensive product catalogs, and active content marketing via blogs and magazines.

Security posture

The website employs HTTPS with strong SSL configuration and implements key security headers such as Content-Security-Policy and Strict-Transport-Security, reflecting a mature security posture. Privacy and cookie policies are comprehensive and GDPR compliant, supported by consent management tools. No direct contact emails or phone numbers for security incidents were found, and no security.txt or vulnerability disclosure pages exist, which could be improved. The use of multiple third-party scripts necessitates ongoing security audits to mitigate supply chain risks. Overall, the site shows good security hygiene but could enhance transparency and incident response readiness.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  3. Provide clear and direct contact information for security incidents and abuse reports.
  4. Regularly audit and update third-party scripts and libraries to prevent vulnerabilities.
  5. Enhance user trust by highlighting certifications or compliance badges related to security and privacy.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Decathlon
Description
Děláme sport dostupnější. Najděte a nakupujte sportovní vybavení pro více než 70 sportů!
Key services
Online retail of sports equipment and apparel, Physical store locations with service, Marketplace for partner sales, Product rental, Buy back and second life product programs, Loyalty program
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Privacy Center SDK, Google Tag Manager, Algolia Search, Adyen Payment, Klarna Payment, Didomi Consent Management, Woosmap API
Frameworks
Custom Decathlon platform, Privacy Center, Dynamic Yield
Platforms
Web desktop, Mobile optimized
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Secure payment integrations
  • Cookie consent management
  • No exposed sensitive data in HTML
  • Use of modern security headers

Analytics and tracking

Services
Google Tag Manager, Dynamic Yield
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Adjust
Tracking pixels
Dynamic Yield, Didomi
Marketing tools
Dynamic Yield, Adjust
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 product listings.
  2. Strong focus on user experience and mobile optimization.
  3. Comprehensive privacy and cookie policies with consent mechanisms.
  4. No direct contact emails or phone numbers publicly listed; contact via support pages.
  5. Use of multiple modern third-party services for analytics, marketing, and payments.
  6. No security.txt or explicit security policy pages found.
  7. WHOIS data unavailable, typical for .cz domains with privacy or registry restrictions.
Technical notes

Notes

Decathlon.cz uses a modern, custom-built e-commerce platform with extensive use of JavaScript and third-party integrations for privacy, analytics, and payments. The site is optimized for performance and mobile responsiveness, with good SEO practices including meta tags and structured data. Accessibility features are present but could be further enhanced. Hosting details are not explicitly available, but the site loads quickly and reliably. The technical stack supports a large product catalog and dynamic content delivery, suitable for a large retail operation. Opportunities exist to improve technical documentation and security transparency.
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. 68/100Medium29 findingsView report
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