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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

72/100

Risk levelMedium

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

O2 CZ is a major telecommunications provider in the Czech Republic offering a wide range of services including mobile tariffs, internet, digital TV (Oneplay), and device sales. The website reflects a strong market position with comprehensive service offerings and a clear focus on consumer and business segments. The company is part of the PPF Group, a significant parent company, which adds to its credibility and market strength. The website is professionally designed, mobile-optimized, and provides rich content about its products and services, targeting a broad audience in the Czech Republic. Technically, the website employs modern web technologies including JavaScript frameworks, Adobe DTM for tag management, Exponea for marketing automation, and Google Tag Manager for analytics. The site is well-structured with good SEO and accessibility features, ensuring a positive user experience across devices. The use of HTTPS and security headers indicates a strong security posture, although explicit security policies and incident response information are not publicly detailed. Security-wise, the site enforces HTTPS, uses a consent management platform for GDPR compliance, and avoids exposing sensitive data in its HTML content. However, the absence of WHOIS data is unusual and reduces transparency, though the website's branding and external references strongly support its legitimacy. No critical vulnerabilities or malicious content were detected. Overall, the website presents a low-risk profile with strong business credibility and technical maturity. Strategic recommendations include publishing explicit security policies, incident response contacts, and vulnerability disclosure information to enhance transparency and trust further.

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

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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  • 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
65
DNS health
85
Network security
100
GDPR outside view
25
Average
72

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 leading position in the Czech telecommunications market, leveraging its parent company PPF Group's resources. Its business model focuses on bundled telecommunications services including mobile, internet, and digital TV, supplemented by device sales and value-added services like O2 Connect and O2 Security. The company targets both individual consumers and business clients, offering tailored solutions such as O2 Spolu bundles. The website's integration with multiple partner domains and digital services indicates a mature ecosystem. Growth indicators include new product launches, promotional offers, and a strong digital presence. The partnership ecosystem includes digital content providers (Oneplay, O2 Knihovna) and event venues (O2 Arena), enhancing brand engagement and customer retention.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, comprehensive security headers, and a consent management platform ensuring GDPR compliance. No exposed sensitive data or vulnerable libraries were identified in the HTML content. However, the lack of publicly available security policies, incident response contacts, and vulnerability disclosure mechanisms represents a compliance and transparency gap. The extensive use of third-party analytics and marketing tools necessitates ongoing security audits to mitigate supply chain risks. Overall, the security culture appears strong but could benefit from enhanced transparency and formalized incident response documentation.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency and user trust.
  2. Implement and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  3. Provide clear contact information for the Data Protection Officer and security team to comply with GDPR and best practices.
  4. Regularly audit and update third-party scripts and libraries to mitigate potential vulnerabilities.
  5. Increase hosting provider transparency and consider publishing infrastructure security certifications.

Contact details published on the site

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

Automated reading of the public site. Ratings are indicative.

Business

Company
O2 CZ
Description
Dopřejte si to nejlepší: neomezený tarif i volání, rychlý internet, Oneplay nebo výhodný balíček služeb O2 Spolu. Vše online i aplikaci Moje O2.
Key services
Mobile tariffs, Internet services, Digital TV (Oneplay), Device sales, O2 Spolu bundles
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Adobe DTM, Exponea, Google Tag Manager, CSS3, HTML5, SVG
Platforms
Web, Mobile (via app links)
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

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

Analytics and tracking

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

Advertising

Ad networks
Crazy Egg
Tracking pixels
Exponea, Crazy Egg, Adobe DTM
Marketing tools
Exponea, Adobe DTM
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 well maintained
  2. Comprehensive privacy and cookie policies with consent management
  3. Strong brand presence with official social media and parent company references
  4. No signs of malicious or suspicious content
  5. WHOIS data unavailable, which is uncommon for a major operator
  6. Extensive use of third-party analytics and marketing tools
  7. Mobile optimized and accessible
  8. Clear navigation and rich content about products and services
Technical notes

Notes

The website uses a modern technology stack including JavaScript, SVG graphics, Adobe DTM for tag management, Exponea for marketing automation, and Google Tag Manager for analytics. The site is mobile-optimized with responsive design and accessibility features. Performance is moderate, with potential for optimization in script loading and resource management. The absence of a detected CMS suggests a custom or proprietary platform. Technical risks include reliance on multiple third-party scripts which require continuous security monitoring. Opportunities exist to enhance performance and transparency regarding hosting and 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

Earlier scans of this domain

  1. 75/100Medium23 findingsView report
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