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Security report for o2knihovna.cz

O2 Czech Republic a.s. · Telecommunications · Czech Republic

Medium risk. 8 critical or high findings in GDPR outside view, Email security and 2 other checks.

Security score

63/100

Risk levelMedium

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

O2 Knihovna is a digital content platform operated by O2 Czech Republic a.s., offering a wide range of e-books, audiobooks, e-magazines, ringtones, and applications primarily targeting Czech-speaking consumers. The platform leverages modern web technologies and integrates advanced analytics and consent management tools to ensure compliance with privacy regulations. The website demonstrates a professional design and user-friendly navigation, supporting a secure login process via SMS verification. Despite the absence of WHOIS data, the strong brand presence and official social media links reinforce its legitimacy. Security practices are sound with HTTPS enforcement and secure forms, though there is room for improvement in publishing explicit security policies and vulnerability disclosures.

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

    • 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

  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 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 o2knihovna.cz

This scan found 22 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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  • 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
60
Email security
40
DNS health
75
Network security
100
GDPR outside view
25
Average
63

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 platform holds a strong market position as a major digital content provider in the Czech Republic, backed by a leading telecommunications company. Its business model centers on e-commerce sales of digital media content, appealing to a broad audience interested in literature and multimedia. The integration with O2's ecosystem and cross-promotion with other O2 services enhances its competitive advantage. The presence of multiple popular content categories and continuous promotional campaigns indicates active market engagement and growth potential. However, direct contact information is limited to web forms, which may impact customer support accessibility.

Security posture

The website maintains a good security posture with HTTPS, secure login mechanisms, and a comprehensive consent management platform ensuring GDPR compliance. The absence of explicit security policies and incident response contacts is a gap that could affect transparency and user trust. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The use of reputable analytics and marketing tools is balanced with user privacy considerations. Enhancing security headers and publishing a vulnerability disclosure policy would further strengthen the security framework.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and incident response procedures.
  2. Implement and report HTTP security headers such as Content Security Policy, HSTS, and X-Frame-Options.
  3. Establish a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Provide clear company contact emails and phone numbers for customer and security inquiries.
  5. Regularly audit third-party scripts and analytics tools to minimize privacy and security risks.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
O2 Czech Republic a.s.
Description
O2 Knihovna offers a digital library service with 55,000 e-books and audiobooks available for download and reading/listening via app or e-reader. It features bestsellers, new releases, and discounted titles across genres such as crime, romance, and fairy tales.
Key services
E-books, Audiobooks, E-magazines, Mobile ringtones, Apps and games
Content quality
good
Branding
consistent

Technology

Stack
jQuery 3.7.1, Adobe Launch (Adobe DTM), Google Tag Manager, Exponea analytics, CMP (Consent Management Platform) from cmp.o2.cz
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management implemented
  • Secure login form with validation
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Exponea, Google Analytics, Adobe Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Google Analytics (via GTM), Facebook Pixel (fbq)
Marketing tools
Exponea
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.
  2. No WHOIS data available, possibly due to privacy or query failure.
  3. Strong presence of privacy and cookie policies with CMP integration.
  4. Secure login form with SMS verification for user authentication.
  5. Multiple external trusted domains used for analytics and content delivery.
  6. No direct contact emails or phone numbers found on main pages; contact via form only.
  7. No explicit security policy or incident response contacts published.
  8. No vulnerability disclosure or security.txt found.
  9. Content is safe and suitable for general audiences.
  10. Good technical implementation with modern libraries and analytics.
Technical notes

Notes

The website uses a modern technology stack including jQuery, Adobe Launch, Google Tag Manager, and Exponea analytics, ensuring robust tracking and marketing capabilities. The site is mobile-optimized with good accessibility features and SEO practices. Performance is moderate, with potential improvements in loading speed through optimization of assets and scripts. The absence of a detected CMS suggests a custom or proprietary platform. Hosting details are not explicitly available. Overall, the technical implementation supports a stable and user-friendly digital content delivery platform.
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. 64/100Medium31 findingsView report
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