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Security report for t-mobile.cz

T-Mobile Czech Republic · Telecommunications · Czech Republic

Low risk. 2 critical or high findings in Security headers and GDPR outside view.

Security score

83/100

Risk levelLow

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

T-Mobile Czech Republic operates a comprehensive telecommunications website offering mobile, fixed internet, and digital TV services targeted at consumers in the Czech Republic. The website demonstrates consistent branding and a professional digital presence, leveraging modern web technologies such as React and Liferay CMS. The technical infrastructure supports moderate performance and good mobile optimization. Security posture is adequate with HTTPS enforced and cookie consent mechanisms in place, though explicit security headers and published security policies are absent. The absence of WHOIS data from the CZ NIC registry limits domain trust assessment but does not detract from the evident legitimacy of the business. Overall, the site is well-positioned in its market with room for improvement in privacy and security transparency.

Scanned

This is an earlier scan of t-mobile.cz. View the latest report

NIS2 and GDPR posture

GDPR outside view
85/ 100 · Low
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

2 findings rated critical or high. Fix these first.

  1. 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';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • 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

Need hands-on remediation? Email guard@offseq.com

Keep watching t-mobile.cz

This scan found 14 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
90
Security headers
65
Email security
85
DNS health
75
Network security
100
GDPR outside view
85
Average
83

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 t-mobile.cz, from OffSeq Breach.

Total records
38,296
Employees
13
Customers
37,968
Third parties
315
Weak passwords
29%

Latest record dated 2026-05-29 · 99 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 t-mobile.cz.

Select it in the checkout above.

Masked preview

  • –adfs.t-mobile.cz2026-05-29
  • –adfs.t-mobile.cz2026-05-25
  • –adfs.t-mobile.cz2025-07-30
  • –cloud.t-mobile.cz2025-07-29
  • –adfs.t-mobile.cz2025-07-26

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

The company is a large telecommunications operator in the Czech Republic, providing tariff plans for households including unlimited calling, mobile data, home internet, and digital TV. The business model focuses on consumer telecommunications services with a strong market position. The website integrates analytics and marketing tools such as Google Tag Manager and Exponea, indicating active customer engagement and data-driven marketing strategies. No explicit partner or subsidiary domains were identified. The lack of visible contact information and privacy policy documents suggests potential areas for enhancing customer trust and regulatory compliance.

Security posture

The website enforces HTTPS and implements cookie consent, reflecting compliance with basic security and privacy standards. However, the absence of security headers such as Content Security Policy, HSTS, and X-Frame-Options reduces defense-in-depth. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The lack of published security policies or incident response contacts limits transparency and preparedness perception. Overall, the security maturity is moderate but could be improved by adopting additional headers, publishing security documentation, and providing clear security contact channels.

Recommendations

  1. Implement and publish a comprehensive privacy policy and terms of service to enhance transparency and compliance.
  2. Add standard security headers (CSP, HSTS, X-Frame-Options) to strengthen security posture.
  3. Publish a security policy and incident response contact information to improve trust and readiness.
  4. Enhance accessibility features to improve inclusivity and compliance with standards.
  5. Provide clear and verified contact information including company emails and phone numbers for customer and security inquiries.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
T-Mobile Czech Republic
Description
U nás pořídíte tarifní řešení pro celou domácnost - neomezené volání, mobilní data, domácí internet i digitální TV. Výhodně v Magentě 1.
Key services
Mobile telephony, Fixed internet, Digital TV, Tariff plans for households
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, React, YUI, Liferay Portal, Google Tag Manager, Exponea, jQuery
Frameworks
Liferay, React
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent banner present
  • No exposed sensitive data detected

Analytics and tracking

Services
Google Analytics (via GTM), Exponea
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
AppNexus (secure.adnxs.com)
Tracking pixels
Exponea
Marketing tools
Exponea
Transparency
basic

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 from CZ NIC for domain
  3. Cookie consent mechanism is implemented
  4. No explicit privacy policy or terms of service found in scanned content
  5. Use of modern web technologies and analytics tools
  6. No explicit contact emails or phone numbers found in scanned HTML
  7. Strong branding consistent with T-Mobile Czech Republic
  8. No security policy or incident response information published
  9. No security headers detected in provided data
  10. No suspicious or malicious indicators found
Technical notes

Notes

The website is built on the Liferay CMS platform with React and YUI JavaScript libraries, integrating Google Tag Manager and Exponea for analytics and marketing. The site uses modern web standards and is mobile optimized with responsive design. Performance is moderate, with combined and minified resources. Accessibility is basic, with some ARIA attributes and alt text improvements needed. SEO is supported by meta tags and Open Graph data. The hosting provider is not explicitly identified. Overall, the technical implementation is solid but could benefit from enhanced accessibility and security header configurations.
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. 85/100 +2Low20 findingsView report
  2. 83/100Low21 findingsView report
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