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Security report for sklik.cz

Seznam.cz, a.s. · Media · Czech Republic

Medium risk. 7 critical or high findings in GDPR outside view and Security headers.

Security score

61/100

Risk levelMedium

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

Seznam.cz, a.s. operates Sklik, a leading Czech online advertising platform that enables advertisers to reach over 97% of the Czech internet population through search and display ads across Seznam.cz and affiliated popular Czech websites. The platform offers a variety of ad formats including text, graphic, product, and video ads, with advanced targeting and retargeting capabilities. The website is professionally designed, mobile-optimized, and provides comprehensive information about advertising services, supported by strong branding and trust indicators.

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

7 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

  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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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';…

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

Keep watching sklik.cz

This scan found 24 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
95
Security headers
15
Email security
60
DNS health
70
Network security
100
GDPR outside view
25
Average
61

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 sklik.cz, from OffSeq Breach.

Total records
177
Employees
0
Customers
177
Third parties
0
Weak passwords
25%

3 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 sklik.cz.

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Breach keeps ingesting new leaks, so these numbers can grow between scans.

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Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Sklik holds a strong market position as the primary Czech advertising platform integrated within the Seznam.cz ecosystem. Its business model is based on pay-per-click and display advertising, targeting businesses and advertisers focused on the Czech market. The platform benefits from local market knowledge, Czech language support, and a wide network of partner sites. The company offers educational resources and professional management services, enhancing customer engagement and retention. Partnerships with major Czech web properties further strengthen its market reach.

Security posture

The website employs HTTPS with strong SSL configuration and uses modern security best practices including consent management for GDPR compliance. While explicit security headers are not fully visible, the site avoids exposing sensitive data and uses reputable third-party services like Google Tag Manager. No vulnerabilities or security incidents are evident. However, the absence of a public vulnerability disclosure policy and incident response contacts suggests room for improvement in transparency and security maturity.

Recommendations

  1. Publish explicit security headers such as Content-Security-Policy and X-Frame-Options to enhance protection.
  2. Implement and publicize a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  3. Provide clear incident response contact information to improve security communication.
  4. Continue monitoring third-party scripts and dependencies for vulnerabilities.
  5. Enhance contact information availability for business and security inquiries.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Seznam.cz, a.s.
Description
Sklik is an advertising platform that allows brands to reach over 97% of the Czech internet population through search and display ads on Seznam.cz and affiliated popular Czech websites.
Key services
Text ads, Graphic ads, Product ads via Seznam Nákupy, Video ads, Campaign management, Conversion tracking, Retargeting, Import campaigns from Google Ads
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress CMS, Google Tag Manager, jQuery, PDF.js, Custom JavaScript modules for UI components
Frameworks
The SEO Framework (WordPress plugin)
Platforms
Seznam.cz advertising platform
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
85/100
Good practices seen
  • Use of HTTPS
  • No exposed sensitive data in HTML
  • Use of consent management platform (CMP)
  • No inline sensitive credentials

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Sklik
Tracking pixels
Seznam tracking scripts
Marketing tools
Seznam CMP
Transparency
good

Site quality

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

Key observations

  1. Website is a professional advertising platform page for Sklik under Seznam.cz
  2. Content is in Czech language with English alternate available
  3. Uses modern web technologies and SEO best practices
  4. Includes comprehensive marketing and advertising information
  5. No direct contact emails or phone numbers found on this page
  6. Social media links to official Seznam.cz accounts present
  7. No security.txt or explicit vulnerability disclosure found
  8. Privacy and cookie policies are present and GDPR compliant
  9. No signs of malicious or suspicious content
Technical notes

Notes

The website is built on WordPress CMS with a modern tech stack including jQuery, Google Tag Manager, and PDF.js for embedded documents. It uses The SEO Framework plugin for SEO optimization and employs custom JavaScript modules for UI components. The site is fast-loading, mobile-optimized, and accessible with good SEO practices. Hosting provider details are not explicit but the infrastructure supports high performance and reliability. The technical implementation aligns well with business needs and user experience expectations.
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. 62/100Medium32 findingsView report
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