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Security report for rentel.cz

RENTEL a.s. · Education · Czech Republic

Medium risk. 8 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

60/100

Risk levelMedium

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

RENTEL a.s. is a Czech-based company specializing in interactive e-learning courses and smart applications designed to develop employees and manage corporate education. Established in 1999, the company has a strong market presence with a proprietary educational portal launched in 2004. Their offerings include multilingual and multimedia courses, webinars, and blended learning solutions, targeting organizations such as firms, government offices, and hospitals. The website demonstrates a mature digital infrastructure built on WordPress with the Divi theme, integrating multiple marketing and analytics tools including Google Analytics, Facebook Pixel, and LinkedIn Insight Tag. Security posture is solid with HTTPS enforced and cookie consent mechanisms in place, though additional security headers and explicit security policies could enhance their stance. Overall, the site is professional, well-branded, and compliant with GDPR, reflecting a trustworthy and credible business.

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

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 rentel.cz

This scan found 25 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

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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
77
Security headers
15
Email security
60
DNS health
80
Network security
100
GDPR outside view
25
Average
60

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

RENTEL a.s. holds a competitive position in the education sector, focusing on corporate training and employee development. Their business model revolves around selling e-learning courses and applications that simplify training management. The company leverages a combination of online and offline training modalities, supported by analytics and automation features in their applications. Their target customers include medium-sized organizations and public institutions in the Czech Republic. The presence of testimonials and certifications on the site supports their credibility. Marketing efforts are robust, utilizing retargeting and tracking technologies to engage potential clients. The company’s long operational history and specialized offerings suggest stable revenue streams and growth potential within the corporate education market.

Security posture

The website employs HTTPS with a valid SSL configuration, ensuring encrypted communications. Cookie consent is managed via the Complianz GDPR plugin, indicating attention to privacy compliance. However, the absence of visible security headers such as Content-Security-Policy or X-Frame-Options suggests room for improvement in defense-in-depth. No exposed sensitive data or vulnerable libraries were detected in the HTML content. The site lacks explicit security policies or incident response contacts, which could be a gap in transparency and preparedness. Overall, the security posture is good but could be enhanced by adopting additional security best practices and publishing clear security governance documentation.

Recommendations

  1. Implement and enforce security headers like Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  2. Publish a dedicated security policy and incident response page with contact details for reporting vulnerabilities.
  3. Regularly audit and update third-party scripts and plugins to mitigate potential vulnerabilities.
  4. Enhance accessibility features to improve compliance and user experience for all visitors.
  5. Maintain transparency by providing WHOIS domain registration details or using verified domain registrars.

Contact details published on the site

Addresses
Legal name
RENTEL a.s.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
RENTEL a.s.
Description
Interaktivní e-learningové kurzy a chytré aplikace pro rozvoj zaměstnanců a správu vzdělávání. Nabízí multijazykové a multimediální kurzy, webináře, prezenční a kombinovaná školení. Poskytují také aplikace pro správu vzdělávání s funkcemi jako hromadné objednávky, tvorba plánů, upozornění a podpora.
Key services
E-learningové kurzy, Vzdělávací aplikace, Podpora a konzultace, Webináře, Prezenční a kombinovaná školení
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, Divi Theme, jQuery, Google Tag Manager, Google Analytics, Facebook Pixel, LinkedIn Insight Tag, Complianz GDPR plugin
Frameworks
Divi
Platforms
WordPress
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent management
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Facebook Pixel, LinkedIn Insight Tag
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Google Ads, Seznam Retargeting
Tracking pixels
Facebook Pixel, LinkedIn Insight Tag
Marketing tools
Complianz GDPR plugin
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 no blocking detected.
  2. WHOIS data is unavailable, which is a concern for domain transparency.
  3. Strong GDPR and cookie compliance with visible consent management.
  4. Professional and consistent branding with clear business focus on e-learning and employee training.
  5. Multiple tracking and advertising scripts present, indicating marketing efforts.
  6. No explicit security policy or incident response information found.
  7. Contact information is clearly presented with email, phone, and physical address.
  8. No suspicious or malicious content detected.
Technical notes

Notes

The website is built on WordPress using the Divi theme, a popular and flexible CMS framework. It uses jQuery and integrates multiple third-party analytics and marketing scripts, including Google Tag Manager, Google Analytics, Facebook Pixel, and LinkedIn Insight Tag. The site is mobile-optimized with responsive design and good SEO practices such as meta tags and structured navigation. Performance is moderate, likely influenced by the number of external scripts and media content. There is no explicit hosting provider information available. The site uses a cookie consent plugin to comply with GDPR, reflecting a modern approach to privacy. Technical debt appears low, but improvements in security headers and accessibility could further strengthen the infrastructure.
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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