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Security report for 21stoleti.cz

Media · Czech Republic

Medium risk. 12 critical or high findings in GDPR outside view, Email security and 2 other checks.

Security score

50/100

Risk levelMedium

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

21stoleti.cz is a well-established Czech online science magazine founded in 2003, offering a broad range of articles covering science, nature, history, medicine, technology, and space. The website targets Czech-speaking audiences interested in educational and scientific content. It operates on a WordPress CMS platform, leveraging modern web technologies including jQuery, Google Analytics, Google Tag Manager, and OneSignal for push notifications. The site is hosted and registered through Active24, a reputable provider in the Czech Republic. Security posture is solid with HTTPS enforced and cookie consent managed via Didomi CMP, although additional security headers could enhance protection. Privacy compliance is moderate due to the absence of an explicit privacy policy and terms of service on the main site. The site integrates advertising and tracking technologies from known providers such as Google DoubleClick and Gemius, with transparent user consent mechanisms. Overall, the website presents a professional and trustworthy media outlet with good technical infrastructure and content quality.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 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

12 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

  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 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 21stoleti.cz

This scan found 28 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

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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
52
Security headers
20
Email security
40
DNS health
75
Network security
100
GDPR outside view
10
Average
50

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 website holds a strong market position as a specialized science media outlet in the Czech Republic, with a history dating back over 20 years. Its business model revolves around content publishing and subscription services, supported by advertising revenue. The target audience is the general Czech public interested in science and knowledge. The site maintains partnerships with related media domains such as enigmaplus.cz and historyplus.cz, enhancing its content ecosystem. The use of modern analytics and marketing tools indicates a mature digital marketing strategy. However, the lack of visible direct contact information and formal privacy/legal documents may limit some trust aspects for business partners or regulatory compliance.

Security posture

The website demonstrates a good security posture with HTTPS enabled and use of modern security practices such as service worker management for push notifications and cookie consent via a reputable CMP (Didomi). However, the absence of several important HTTP security headers (e.g., Content-Security-Policy, X-Frame-Options) is a gap that could expose the site to certain web-based attacks. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The site lacks a published security policy or incident response contact, which are recommended for transparency and readiness. Overall, the security maturity is good but could be improved with additional headers and formal policies.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service accessible from the homepage.
  2. Implement additional HTTP security headers such as Content-Security-Policy, X-Frame-Options, and Referrer-Policy.
  3. Add a security policy and incident response contact information to improve transparency and readiness.
  4. Provide clear company contact information including emails and phone numbers for user support and business inquiries.
  5. Regularly review and update third-party scripts and libraries to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
Online Czech science magazine providing articles on science, nature, history, medicine, technology, and space.
Key services
Science articles, Online magazine content, Subscription service
Content quality
good
Branding
consistent

Technology

Stack
WordPress, jQuery, Google Analytics, Google Tag Manager, OneSignal Push Notifications, Prebid.js, Gemius Analytics, Swiper.js, GLightbox
Frameworks
WordPress
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of Google Tag Manager and Analytics with async loading
  • Cookie consent management via Didomi CMP
  • Service worker management for push notifications

Analytics and tracking

Services
Google Analytics, Gemius
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Google DoubleClick, CPEX
Tracking pixels
Gemius, Facebook Pixel
Marketing tools
OneSignal Push Notifications
Transparency
good

Site quality

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

Key observations

  1. Website is a well-established Czech science magazine with rich content.
  2. Uses modern web technologies and analytics tools.
  3. Has a comprehensive cookie consent mechanism via Didomi CMP.
  4. No explicit privacy policy or terms of service found on the homepage or main HTML content.
  5. No direct contact emails or phone numbers found in the provided content.
  6. No visible security.txt or vulnerability disclosure policy.
  7. No signs of WAF or content blocking.
  8. Content is safe and suitable for general audiences.
  9. Social media presence on Facebook and Twitter is evident.
  10. Advertising and tracking practices are transparent and use known providers.
Technical notes

Notes

The website is built on WordPress CMS with a modern tech stack including jQuery, Google Analytics, Google Tag Manager, OneSignal push notifications, and advertising technologies like Prebid.js and Gemius. The site is mobile optimized with responsive design and uses modern CSS and JavaScript libraries for UI components. Performance is moderate, with asynchronous loading of analytics and advertising scripts to improve load times. Hosting is provided by Active24, a known Czech hosting provider. The site uses a cookie consent management platform (Didomi) to comply with privacy regulations. Technical risks include missing security headers and potential dependency on multiple third-party scripts which require ongoing maintenance to avoid vulnerabilities.
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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