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Security report for du.cz

Verlag Dashöfer · Finance · Czech Republic

High risk. 9 critical or high findings in GDPR outside view, Email security and 3 other checks.

Security score

47/100

Risk levelHigh

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

The website www.du.cz is a professional Czech online portal operated by Verlag Dashöfer, providing a comprehensive knowledge library and educational resources focused on taxes, accounting, law, labor, and payroll for professionals such as accountants, tax advisors, and economists. The platform offers subscription-based access to legal texts, commentaries, practical examples, and online seminars, positioning itself as a leading resource in the Czech Republic for financial and legal professionals. Technically, the site employs modern web technologies including Bootstrap 4, jQuery, and Font Awesome, with integrated analytics and advertising tools such as Google Tag Manager and Microsoft Clarity. Security posture is good with HTTPS enforced and use of reCAPTCHA on forms, though some security headers could be improved. Privacy compliance is basic, lacking explicit privacy and cookie policies in the analyzed content. The absence of WHOIS data limits domain legitimacy verification, but the professional presentation and consistent branding support a credible business identity.

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

9 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. 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.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  3. 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 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 du.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
72
Security headers
30
Email security
60
DNS health
75
Network security
20
GDPR outside view
25
Average
47

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 du.cz, from OffSeq Breach.

Total records
77
Employees
0
Customers
77
Third parties
0
Weak passwords
0%

5 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 du.cz.

Select it in the checkout above.

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

Open in Breach(opens in a new tab)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

Verlag Dashöfer operates www.du.cz as a specialized knowledge portal targeting finance and legal professionals in the Czech Republic. The business model revolves around subscription access to curated, up-to-date legal and tax information, supplemented by online seminars and training. The portal's market position is strong within its niche, supported by a broad content offering and trusted brand signals such as guarantees of accuracy. Partnerships with seminar providers (www.kursy.cz) enhance the educational value. The platform's revenue streams likely include subscriptions and paid seminars. The target customer segments are professional accountants, tax consultants, payroll specialists, and legal advisors. Growth indicators include frequent content updates and active seminar scheduling. The ecosystem includes related domains under Verlag Dashöfer, indicating a consolidated publishing and educational group.

Security posture

The website demonstrates a mature security posture with mandatory HTTPS usage and integration of Google reCAPTCHA to protect forms from automated abuse. Analytics and advertising scripts are present but do not expose sensitive data in the HTML. However, the absence of explicit security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options suggests room for improvement in defense-in-depth. No vulnerabilities or exposed credentials were detected in the analyzed content. Privacy compliance is limited, with no visible privacy or cookie policies, which could pose regulatory risks under GDPR. Incident response and security policy information are not publicly available, indicating potential gaps in transparency. Overall, the site is secure but could enhance its security posture by implementing recommended HTTP headers and publishing privacy and security policies.

Recommendations

  1. Implement comprehensive privacy and cookie policies with clear user consent mechanisms to improve GDPR compliance.
  2. Add and enforce security headers such as Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy to strengthen security posture.
  3. Publish security policy and incident response contact information to enhance transparency and trust.
  4. Regularly audit and update third-party libraries and scripts to mitigate potential vulnerabilities.
  5. Enhance accessibility features to meet modern standards and improve user experience for all users.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Verlag Dashöfer
Description
Knihovna pro daně, účetnictví, právo, práci a mzdy pro hlavní účetní, účetní, daňaře, mzdové účetní, daňové poradce a ekonomy - účetní, daňové, právní informace, komentáře, příklady, školení, judikatura.
Key services
online library of tax, accounting, legal, labor and payroll information, commentaries and examples, online seminars and training, legal and tax updates, searchable database of laws and regulations
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery 3.3.1, Bootstrap 4, Font Awesome 6, Google Tag Manager, Microsoft Clarity, Bing Ads, Seznam RC.js, Google reCAPTCHA
Frameworks
Bootstrap 4
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA for forms
  • No exposed sensitive data in HTML
  • No obvious vulnerable libraries detected

Analytics and tracking

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

Advertising

Ad networks
Bing Ads
Tracking pixels
Microsoft Clarity, Google Analytics (via GTM)
Marketing tools
Microsoft Clarity
Transparency
good

Site quality

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

Key observations

  1. Website is a professional Czech online portal focused on tax, accounting, law, labor, and payroll.
  2. Content is rich, well-structured, and targeted at professionals in finance and law.
  3. No WHOIS data available, which limits domain trust verification.
  4. No explicit privacy or cookie policies found on the main page HTML.
  5. Multiple external analytics and advertising scripts are used, including Microsoft Clarity and Bing Ads.
  6. Security best practices are partially implemented; HTTPS is used but some security headers are not explicitly detected.
  7. No signs of adult or questionable content; content is safe and professional.
  8. Forms include login and registration with GDPR consent checkbox for newsletter subscription.
  9. No direct contact emails or phone numbers found in the provided HTML snippet.
  10. Website uses modern frontend technologies including Bootstrap 4 and Font Awesome 6.
Technical notes

Notes

The website uses a modern frontend stack with Bootstrap 4 for responsive design, jQuery for DOM manipulation, and Font Awesome 6 for icons. It integrates multiple third-party analytics and advertising services including Google Tag Manager, Microsoft Clarity, Bing Ads, and Seznam scripts. The site loads multimedia content such as videos and uses AJAX for dynamic content loading. Performance appears moderate with some optimization potential. Mobile optimization is good, with responsive navigation and layout. SEO is supported by canonical tags, meta descriptions, and structured navigation. No CMS is explicitly detected, suggesting a custom or proprietary platform. Hosting provider details are not available. Overall, the technical implementation is solid but could benefit from enhanced security headers and privacy features.
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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