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Security report for cloverbooks.cz

ISSA CZECH s.r.o. · Education · Czech Republic

Medium risk. 7 critical or high findings in GDPR outside view, Security headers and 2 other checks.

Security score

61/100

Risk levelMedium

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

Jazyková škola Cloverleaf Ostrava is a well-established language school operating since 1993, offering a broad range of language courses including English, Cambridge exam preparation, e-learning, and corporate training. The school targets a diverse audience including individuals, children, youth, and corporate clients, positioning itself as the largest language school in the Ostrava region. The website is professionally designed, mobile-optimized, and provides comprehensive information about courses, contact details, and policies. Technically, the site uses modern frameworks like Bootstrap and integrates multiple analytics and marketing tools such as Google Analytics, Facebook Pixel, and Seznam Retargeting. Security posture is good with HTTPS enforced and cookie consent mechanisms in place, though some security headers are missing and no explicit incident response or security policy pages are found. The absence of WHOIS data for the domain reduces trustworthiness slightly, but the overall business credibility remains high due to transparent contact information and professional presentation.

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

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

      Third-party services without privacy policy

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

      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 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 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 cloverbooks.cz

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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
67
Security headers
35
Email security
60
DNS health
65
Network security
100
GDPR outside view
40
Average
61

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

The company operates in the education sector, focusing on language training and related services. It leverages partnerships with recognized associations and maintains an e-commerce presence through Cloverbooks. The business model includes direct course offerings, exam preparation, e-learning, and supplementary services like translation and language audits. The target market includes students, professionals, and educational institutions primarily in the Czech Republic. The company benefits from a strong regional market position and a comprehensive service portfolio. The website reflects a mature digital presence with integrated marketing and tracking tools, supporting customer engagement and lead generation. Strategic partnerships with ISSA CZECH s.r.o. and other entities enhance operational capabilities and brand trust.

Security posture

The website demonstrates a solid security foundation with HTTPS enforced and a GDPR-compliant cookie consent mechanism. The login form uses secure password fields, and no sensitive data is exposed in the HTML. However, the lack of visible security headers such as Content Security Policy, HSTS, and X-Frame-Options suggests room for improvement. No vulnerability disclosures or incident response contacts are published, which could hinder rapid response to security incidents. The use of multiple third-party tracking scripts requires ongoing monitoring to mitigate privacy risks. Overall, the security posture is good but could be enhanced by implementing recommended headers and publishing security policies.

Recommendations

  1. Implement standard security headers (CSP, HSTS, X-Frame-Options) to strengthen defense-in-depth.
  2. Publish an incident response policy and contact information to improve transparency and readiness.
  3. Create and maintain a security.txt file to facilitate vulnerability reporting.
  4. Regularly audit third-party scripts and tracking tools for privacy and security compliance.
  5. Enhance accessibility features to meet broader compliance standards and improve user experience.

Contact details published on the site

Addresses
Legal name
ISSA CZECH s.r.o.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ISSA CZECH s.r.o.
Description
Jazyková škola Cloverleaf Ostrava je největší jazyková škola v regionu s tradicí od roku 1993. Nabízí širokou škálu jazykových kurzů, včetně angličtiny, přípravy na Cambridge zkoušky, e-learningu, kurzů pro děti, mládež a firemní výuku. Škola klade důraz na kvalitní lektorský tým, moderní technické zázemí a individuální přístup ke studentům.
Key services
Jazykové kurzy pro veřejnost, Cambridge zkoušky, E-learning, Kurzy pro děti a mládež, Firemní výuka, Překlady a tlumočení, Jazykový audit, Prodej učebnic (eshop Cloverbooks)
Content quality
good
Branding
consistent

Technology

Stack
Google Analytics, Google Tag Manager, Facebook Pixel, Seznam Retargeting, Bootstrap (CSS classes like navbar, container), jQuery (implied by Bootstrap usage), CMS Designer (redakční systém: CMS Designer), JavaScript, HTML5, CSS3
Frameworks
Bootstrap
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with explicit opt-in/out
  • No exposed sensitive data in HTML
  • Secure login form with password field

Analytics and tracking

Services
Google Analytics, Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads, Seznam Retargeting
Tracking pixels
Facebook Pixel
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and no blocking detected.
  2. Comprehensive cookie consent mechanism implemented with explicit user choices.
  3. Multiple Google Analytics and Facebook Pixel scripts indicate moderate user tracking.
  4. WHOIS data is missing, which is unusual and reduces domain trust score.
  5. Website uses HTTPS with no visible security warnings.
  6. Contact information is clearly presented including phone, email, and physical address.
  7. Website content is focused on language education with no adult or questionable content.
  8. No explicit security or incident response policies found on the site.
  9. Site uses a professional CMS and modern frontend frameworks.
  10. External links mostly to trusted partners and service providers.
Technical notes

Notes

The website is built on a CMS Designer platform with Bootstrap framework for responsive design. It integrates multiple analytics and marketing scripts including Google Analytics, Google Tag Manager, Facebook Pixel, and Seznam Retargeting. The site uses modern HTML5 and CSS3 standards and is mobile-optimized with good navigation clarity. Performance is moderate, with potential improvements in loading speed by optimizing third-party scripts. The absence of some security headers and incomplete WHOIS data represent technical risks. Overall, the technical infrastructure supports the business needs effectively but could benefit from security and performance optimizations.
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. 61/100Medium33 findingsView report
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