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Security report for kastnersw.cz

KASTNER software · Technology · Czech Republic

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

Security score

51/100

Risk levelMedium

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

KASTNER software is a Czech-based software company specializing in economic, accounting, and tax software solutions tailored for small businesses and entrepreneurs. Their main products include FORM studio for electronic forms, STEREO for accounting and tax management, and ENTER for invoicing and cash register functions. The company positions itself as an experienced provider with over 30 years in the industry and a user base exceeding 10,000 customers. The website is professionally designed, consistent in branding, and provides clear information about their offerings and support services. Technically, the website leverages modern web technologies such as Blazor Server for its frontend framework, integrates multiple analytics and marketing tools including Google Tag Manager, Facebook Pixel, Smartlook, and Seznam Analytics, and employs Google reCAPTCHA v3 for bot protection. The site is mobile-optimized and includes cookie consent mechanisms aligned with GDPR requirements. Performance is moderate with good SEO and basic accessibility features. From a security perspective, the site uses HTTPS and includes anti-bot measures, but lacks explicit security headers visible in the HTML source. No vulnerabilities or exposed sensitive data were detected. However, the absence of WHOIS data for the domain raises some concerns about domain registration transparency and trustworthiness. No direct contact emails or phone numbers are present on the main page, which could impact user trust and support accessibility. Overall, the website presents a professional and trustworthy front for KASTNER software's business, but improvements in domain registration transparency, security header implementation, and clearer contact information would enhance its security posture and business credibility.

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

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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Keep watching kastnersw.cz

This scan found 21 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
100
Security headers
20
Email security
60
DNS health
80
Network security
20
GDPR outside view
25
Average
51

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

KASTNER software operates in the technology sector, focusing on software solutions for accounting, tax, and electronic form management primarily targeting small businesses in the Czech Republic and Slovakia. Their business model revolves around software licensing with free trials and online purchases. The company leverages its long-standing market presence and a sizable user base as competitive advantages. The website indicates a mature partnership ecosystem including social media presence and charitable affiliations. Revenue streams likely include software sales, support services, and updates. The company maintains a consistent brand image and provides regular updates and technical support, signaling a stable operational model with growth potential in the regional SME market.

Security posture

The website demonstrates a moderate to good security maturity level with HTTPS enforced and integration of Google reCAPTCHA v3 to mitigate automated abuse. Cookie consent and privacy policy implementation indicate compliance with GDPR. However, the lack of visible security headers such as Content-Security-Policy and Referrer-Policy suggests room for improvement. No incident response or vulnerability disclosure information is provided, which could hinder timely security issue reporting. The absence of WHOIS data reduces domain trustworthiness and may indicate privacy protection or registration issues. Overall, the security posture is adequate for the business type but would benefit from enhanced transparency and additional security controls.

Recommendations

  1. Implement and publish explicit security headers including Content-Security-Policy, X-Content-Type-Options, and Referrer-Policy to strengthen browser security.
  2. Provide clear incident response and vulnerability disclosure contact information to improve security transparency and responsiveness.
  3. Enhance accessibility features to comply with best practices and improve user experience for all visitors.
  4. Publish terms of service and more detailed privacy documentation to increase legal compliance and user trust.
  5. Verify and publish domain registration information or ensure WHOIS data availability to improve legitimacy and trust signals.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
KASTNER software
Description
Vyzkoušejte FORM studio - databázi elektronických formulářů a software na jejich vyplňování a elektronické podání, účetní software STEREO nebo fakturační a pokladní systém ENTER.
Key services
FORM studio - electronic forms software, STEREO - accounting and tax software, ENTER - invoicing and cash register software
Content quality
good
Branding
consistent

Technology

Stack
Blazor Server, Google Tag Manager, Google reCAPTCHA v3, Facebook Pixel, Smartlook, Seznam Analytics, CKEditor 5
Frameworks
Blazor
Platforms
Windows (application downloads)
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Google reCAPTCHA v3 integration
  • Cookie consent mechanism implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Seznam Analytics, Smartlook
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads, DoubleClick
Tracking pixels
Facebook Pixel, Google Analytics (via GTM), Smartlook, Seznam Analytics
Marketing tools
Facebook Pixel
Transparency
good

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 challenge.
  2. WHOIS data is unavailable, indicating possible privacy protection or domain registration issues.
  3. Website uses modern technologies including Blazor and multiple analytics/tracking tools.
  4. Cookie consent and privacy policy are implemented with GDPR compliance.
  5. No direct contact emails or phone numbers found on main page; contact likely via dedicated pages.
  6. No explicit terms of service or security policy pages detected.
  7. Website content is professional and targeted at Czech and Slovak small business users.
  8. No adult or questionable content detected.
  9. Advertising and tracking practices are transparent and use common industry tools.
Technical notes

Notes

The website is built using Blazor Server technology, indicating a modern single-page application architecture. It integrates multiple third-party analytics and marketing tools such as Google Tag Manager, Facebook Pixel, Smartlook, and Seznam Analytics, which provide comprehensive user behavior tracking and marketing capabilities. The site uses Google reCAPTCHA v3 for bot mitigation. Performance is moderate with good SEO practices including meta tags and Open Graph data. Mobile optimization is good, but accessibility is basic and could be improved. The site does not appear to use a common CMS but rather a custom Blazor-based solution. Hosting provider details are not discernible from the HTML content. Overall, the technical implementation is solid but could benefit from enhanced security headers and accessibility improvements.
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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