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Security report for cez.cz

ČEZ Prodej a.s. · Energy · Czech Republic

Medium risk. 4 critical or high findings in GDPR outside view and SSL/TLS.

Security score

73/100

Risk levelMedium

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

ČEZ Prodej a.s. operates as a major energy company in the Czech Republic, providing electricity, gas, heating, and related services to both residential and business customers. The company holds a strong market position as one of the leading energy producers and distributors in the region, offering a broad portfolio including photovoltaics, heating technologies, and mobile services. The website reflects a mature digital presence with comprehensive content, clear navigation, and professional branding consistent with a large enterprise. Technically, the site leverages modern JavaScript frameworks and integrates advanced search and analytics tools, indicating a well-developed digital infrastructure. Security posture is solid with HTTPS enforcement and cookie consent mechanisms, though explicit security policies and incident response contacts are not publicly disclosed. Overall, the site is trustworthy and professionally maintained, though the absence of WHOIS data reduces domain registration transparency.

Scanned

NIS2 and GDPR posture

GDPR outside view
40/ 100 · High
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

4 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

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, Twitter, LinkedIn, YouTube

      What to do: Document all third-party data sharing in your privacy policy

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching cez.cz

This scan found 17 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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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
70
Security headers
75
Email security
70
DNS health
85
Network security
100
GDPR outside view
40
Average
73

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 cez.cz, from OffSeq Breach.

Total records
28,903
Employees
31
Customers
28,733
Third parties
139
Weak passwords
12%

Latest record dated 2026-05-20 · 61 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 cez.cz.

Select it in the checkout above.

Masked preview

  • –cezonline.cez.cz2026-05-20
  • –sts.cez.cz2026-04-25
  • –cas.cez.cz2026-04-25
  • –sts.cez.cz2026-04-25
  • –cas.cez.cz2026-04-23

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 targets both B2C and B2B segments in the energy sector, providing services ranging from energy supply to technology installations and customer support. Its business model is diversified across energy production, distribution, and retail, supported by subsidiaries and partner sites for specialized services and education. The presence of official social media channels and structured data enhances credibility and customer engagement. The company appears to be enterprise-sized with a strong brand and market presence in the Czech Republic. Growth indicators include active promotion of new technologies and customer self-service platforms. The partnership ecosystem includes energy service companies, educational platforms, and career portals, reflecting a comprehensive operational footprint.

Security posture

The website demonstrates a good security baseline with HTTPS and cookie consent management. Security headers are implied but not explicitly confirmed in the HTML. No vulnerabilities or exposed sensitive data were detected in the content. However, the absence of a published vulnerability disclosure policy and incident response contacts suggests room for improvement in transparency and readiness. The use of third-party analytics and marketing scripts is managed with consent mechanisms, aligning with GDPR compliance. Overall, the security posture is mature but could benefit from enhanced policy disclosures and security header verification.

Recommendations

  1. Publish explicit security headers such as X-Frame-Options and X-Content-Type-Options to strengthen browser security.
  2. Establish and publicize a vulnerability disclosure policy and incident response contact to improve transparency and security culture.
  3. Enhance accessibility features to meet higher compliance standards and improve user experience for all users.
  4. Regularly audit third-party scripts and dependencies to mitigate risks from external libraries.
  5. Maintain updated WHOIS information or clarify domain registration privacy to improve domain trustworthiness.

Contact details published on the site

Addresses
Legal name
ČEZ Prodej a.s.
VAT number
CZ27232433
Registration number
27232433
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ČEZ Prodej a.s.
Description
Skupina ČEZ patří mezi nejvýznamnější výrobce, distributory, obchodníky v oblasti elektřiny a tepla, zemního plynu.
Key services
Electricity supply, Gas supply, Photovoltaics, Heating solutions, Mobile services, Customer support and online self-service
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Vue.js (implied by template syntax), Google Tag Manager, Cookiebot, Luigisbox autocomplete and search, Smartics analytics scripts
Frameworks
Vue.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism
  • No exposed sensitive data in HTML
  • Use of Google Tag Manager for controlled analytics

Analytics and tracking

Services
Google Tag Manager, Smartics
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Cookiebot, Smartics
Marketing tools
Luigisbox autocomplete and search
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. No WHOIS data available, which is unusual for a major enterprise domain.
  3. Strong presence of official social media and structured data.
  4. Cookie consent and privacy mechanisms are implemented.
  5. No visible security or WAF blocking issues.
  6. No explicit security or incident response policies found on site.
  7. Multiple external trusted domains linked, including subsidiaries and partners.
  8. No suspicious or malicious content detected.
Technical notes

Notes

The website uses modern web technologies including Vue.js for frontend templating, advanced autocomplete and search libraries from Luigisbox, and integrates Google Tag Manager and Cookiebot for analytics and consent management. The site is mobile-optimized with responsive design and good SEO practices including meta tags and structured data. Performance is moderate, with asynchronous loading of scripts and optimized images. No CMS is explicitly detected, suggesting a custom or proprietary platform. Hosting provider details are not disclosed. The technical implementation supports a professional and scalable digital presence suitable for a large enterprise.
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. 56/100Medium21 findingsView report
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