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Security report for tesinsko.cz

SilesNet s.r.o. · Telecommunications · Czech Republic

Medium risk. 8 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

63/100

Risk levelMedium

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

SilesNet s.r.o. is a regional internet service provider based in the Czech Republic with a 27-year history. The company offers a range of internet connectivity solutions including fiber and wireless internet for residential apartments, houses, and business organizations. Additionally, they provide television services and technical support, emphasizing reliability and personalized customer service. The website reflects a professional and regionally focused business model targeting local customers. Technically, the site uses modern JavaScript libraries such as Swiper.js and Google Tag Manager, and implements cookie consent mechanisms, indicating a moderate level of digital maturity. However, the absence of WHOIS data and lack of published privacy and terms policies represent gaps in transparency and compliance. Security posture is adequate with HTTPS usage but could be improved by adding security headers and formal incident response information. Overall, the website is safe, well-designed, and trustworthy, but would benefit from enhanced compliance documentation and security best practices.

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

8 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';…

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  • TLS certificates and expiry
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  • Security headers
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  • 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
65
Security headers
20
Email security
70
DNS health
80
Network security
100
GDPR outside view
40
Average
63

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

SilesNet holds a strong position as a regional ISP with a long-standing market presence, leveraging a combination of fiber and wireless technologies to serve diverse customer segments including residential users and businesses. Their business model focuses on tailored service offerings and personal customer engagement, which is a competitive advantage in their local market. Revenue streams likely come from internet subscriptions, television packages, and technical support services. The company maintains a clear brand identity and consistent messaging. Partnerships appear limited to internal service portals. Growth indicators include a broad tariff offering and emphasis on service quality. Strategic observations suggest opportunities to expand digital transparency and security compliance to enhance customer trust and regulatory adherence.

Security posture

The current security maturity level is moderate. The website uses HTTPS and has implemented cookie consent, which aligns with basic privacy compliance. However, the lack of security headers such as Content Security Policy, HSTS, and X-Frame-Options reduces protection against common web attacks. No vulnerability disclosure or incident response information is published, which limits transparency and preparedness. The absence of WHOIS data raises concerns about domain registration legitimacy, although the website content itself shows no signs of compromise or malicious activity. Compliance with GDPR is partial due to missing privacy policy documentation. Overall, the security posture is functional but requires improvements in transparency, policy publication, and technical hardening to reduce risk.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service to improve compliance and user trust.
  2. Implement and configure security headers (CSP, HSTS, X-Frame-Options) to enhance web security.
  3. Establish and publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  4. Verify and update WHOIS domain registration information to ensure transparency and legitimacy.
  5. Enhance accessibility features and conduct regular security audits of third-party scripts.

Contact details published on the site

Addresses
Legal name
SilesNet s.r.o.
VAT number
CZ25392280
Registration number
25392280
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
SilesNet s.r.o.
Description
Regional internet service provider with 27 years of market presence offering fiber and wireless internet solutions for homes, businesses, and organizations. Provides television services and technical support with a focus on reliability and personal approach.
Key services
Fiber and wireless internet for apartments, Internet for houses, Internet for businesses and organizations, Television services, Technical support
Content quality
good
Branding
consistent

Technology

Stack
Swiper.js, Google Tag Manager, Google Analytics, JavaScript modules, Cookie consent scripts
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • Use of HTTPS (implied by URL https://)
  • Cookie consent mechanism implemented

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

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 no blocking or WAF challenges.
  2. Content is professionally presented in Czech language targeting local customers.
  3. No explicit privacy policy or terms of service pages found.
  4. Cookie consent mechanism is implemented and functional.
  5. WHOIS data is missing, which is unusual and reduces domain trust.
  6. Contact information is clearly presented with company emails, phone, and address.
  7. Use of modern JavaScript libraries and tracking tools is evident.
  8. No security.txt or incident response info found.
  9. No certifications or security frameworks mentioned.
  10. Website is safe with no adult or questionable content.
Technical notes

Notes

The website employs a modern front-end technology stack including Swiper.js for sliders and Google Tag Manager for analytics and marketing tags. Cookie consent is managed via a third-party script hosted on rails.cz, indicating some reliance on external hosting for assets. The site is mobile optimized with responsive images and navigation. Performance is moderate with asynchronous loading of scripts. No CMS or backend platform is explicitly detected. Hosting provider is not clearly identified but may be related to rails.cz infrastructure. Technical debt appears low but the absence of security headers and incomplete metadata suggest areas for modernization. SEO is supported by proper meta tags and Open Graph data, though structured data like JSON-LD is missing. Overall, the technical implementation is solid but could benefit from enhanced security and compliance features.
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

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