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Security report for o2.cz

O2 CZ · Telecommunications · Czech Republic

Medium risk. 6 critical or high findings in GDPR outside view and Security headers.

Security score

75/100

Risk levelMedium

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

O2 CZ is a leading telecommunications provider in the Czech Republic offering a broad range of services including mobile tariffs, internet connectivity, digital television (Oneplay), and bundled service packages under the O2 Spolu brand. The company targets both individual consumers and business clients, providing online and mobile app-based service management to enhance customer experience. The website reflects a mature digital presence with comprehensive service offerings and clear navigation. Technically, the website employs modern web technologies including JavaScript frameworks, Adobe DTM for tag management, Google Tag Manager, and marketing tools like Exponea and Persoo. The site is mobile-optimized, accessible, and SEO-friendly, indicating a high level of digital maturity. Performance is moderate with room for optimization. From a security perspective, the site enforces HTTPS with strong SSL configuration and implements multiple security headers. Consent management is integrated, supporting GDPR compliance. However, explicit security policies and incident response information are not publicly available, which could be improved to enhance transparency and trust. Overall, the website is professional, trustworthy, and compliant with privacy regulations. The absence of WHOIS data is a notable gap in transparency but does not detract significantly from the site's legitimacy given the strong brand presence and comprehensive content. Strategic recommendations include publishing security policies, vulnerability disclosure mechanisms, and maintaining updated WHOIS records.

Scanned

This is an earlier scan of o2.cz. View the latest report

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

6 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. 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';…

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Keep watching o2.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
100
Security headers
55
Email security
82
DNS health
85
Network security
100
GDPR outside view
25
Average
75

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

O2 CZ holds a strong market position as a major telecom operator in the Czech Republic, backed by the PPF Group. Its business model revolves around providing integrated telecommunications services including mobile, internet, and digital TV, with a focus on bundled offerings to increase customer retention and value. The company leverages partnerships with services like Oneplay and O2 Knihovna to diversify offerings. Revenue streams likely include subscription fees, device sales, and value-added services. The target customer segments include individual consumers, small businesses, and enterprises. The website's extensive content and marketing tools indicate active customer engagement and growth orientation. The partnership ecosystem includes prominent domains related to PPF and digital services, supporting a robust operational network.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, strong SSL configuration, and multiple security headers such as Content-Security-Policy and X-Frame-Options. The integration of a consent management platform aligns with GDPR requirements, reflecting good privacy practices. No exposed sensitive data or vulnerable libraries were detected in the HTML content. However, the absence of publicly available security policies, incident response contacts, or vulnerability disclosure programs represents a compliance gap and an area for improvement. The use of multiple third-party scripts necessitates ongoing security audits to mitigate supply chain risks. Overall, the security posture is strong but could be enhanced by increasing transparency and formalizing incident response mechanisms.

Recommendations

  1. Publish a dedicated security policy and incident response information on the website to improve transparency and user trust.
  2. Implement and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting of security issues.
  3. Enhance visible contact information specifically for security incidents, including dedicated security or abuse email addresses.
  4. Regularly audit and update third-party scripts and libraries to minimize vulnerabilities from external dependencies.
  5. Update and maintain accurate WHOIS records to improve domain registration transparency and trustworthiness.

Contact details published on the site

Addresses
Legal name
O2 Czech Republic a.s.
VAT number
CZ60193336
Registration number
IČO 60193336
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
O2 CZ
Description
O2 CZ offers mobile tariffs, internet, digital television (Oneplay), and bundled services under O2 Spolu. They provide online and app-based service management.
Key services
Mobile tariffs, Internet services, Digital TV (Oneplay), Bundled services (O2 Spolu), Device sales
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Adobe DTM, Google Tag Manager, Exponea, Persoo, CSS3, HTML5
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management platform implemented
  • No exposed sensitive data in HTML
  • Secure forms with autocomplete off

Analytics and tracking

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

Advertising

Ad networks
Crazy Egg
Tracking pixels
Exponea, Crazy Egg, Adobe DTM
Marketing tools
Exponea, Persoo
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed and content-rich.
  2. Comprehensive privacy and cookie policies with consent management implemented.
  3. No WHOIS data available, which is unusual for a major telecom operator.
  4. Multiple official social media and partner links present.
  5. Use of modern analytics and marketing tools.
  6. No visible security vulnerabilities or blocking detected.
  7. Clear navigation and mobile optimization.
  8. No explicit security policy or incident response information found.
Technical notes

Notes

The website uses a modern technology stack including JavaScript, Adobe DTM, Google Tag Manager, and marketing platforms like Exponea and Persoo. The site is built with responsive design principles ensuring excellent mobile optimization and good accessibility. SEO is well addressed with proper meta tags, Open Graph data, and structured JSON-LD data for organization and breadcrumb navigation. Performance is moderate, with potential improvements in loading speed and script optimization. No CMS was explicitly detected, suggesting a custom or proprietary platform. Hosting provider details are not disclosed. The technical implementation supports a professional and user-friendly experience but could benefit from performance tuning and enhanced security transparency.
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. 72/100Medium25 findingsView report
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