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Security report for muzeumharmonik.cz

as4u.cz, s.r.o. · Other · Czech Republic

Medium risk. 6 critical or high findings in GDPR outside view and Security headers.

Security score

67/100

Risk levelMedium

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

Muzeum harmonik is a Czech cultural museum website dedicated to the exhibition and education about harmonicas and accordions. The site is professionally designed with a clear focus on showcasing historical musical instruments and providing visitor information. The target audience includes general visitors interested in musical heritage and cultural artifacts. The business model is non-commercial, focusing on cultural preservation and education. Technically, the website uses a custom CMS called Public4u and includes JavaScript libraries such as jQuery and jQuery UI. The site is moderately optimized for mobile devices and has a good user experience with clear navigation. Security posture is moderate; HTTPS is used but no security headers were detected in the HTML source. Privacy and cookie policies are absent, which is a compliance gap. The WHOIS data for the domain is missing, which reduces transparency and trustworthiness. Overall, the website is functional and professional but would benefit from improved security practices and privacy compliance.

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

6 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

      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

  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 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 muzeumharmonik.cz

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  • TLS certificates and expiry
  • DNS records
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  • 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
85
Security headers
40
Email security
67
DNS health
85
Network security
100
GDPR outside view
25
Average
67

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

The museum operates in a niche cultural sector focused on musical instruments, specifically harmonicas and accordions. It appears to be a small entity, likely local or regional in scope, with a clear educational and cultural mission. The website is managed by as4u.cz, s.r.o., which may be a service provider or the owning entity. The presence of a Facebook page indicates some social media engagement. There is no evidence of commercial activities such as e-commerce or advertising. The museum likely relies on visitor attendance and cultural grants or sponsorships. The lack of WHOIS data is unusual and may warrant further investigation to confirm domain ownership and legitimacy.

Security posture

The website uses HTTPS, which is a fundamental security measure. However, no security headers such as Content-Security-Policy, X-Frame-Options, or HSTS were detected, which are recommended to enhance security against common web attacks. No vulnerable libraries or exposed sensitive data were found in the HTML content. The absence of privacy and cookie policies indicates a compliance gap with GDPR and other data protection regulations. There is no evidence of incident response or security contact information. Overall, the security posture is moderate but could be significantly improved by implementing security headers, privacy policies, and regular security audits.

Recommendations

  1. Implement standard security headers including Content-Security-Policy, X-Frame-Options, and HSTS to improve web security.
  2. Publish comprehensive privacy and cookie policies to comply with GDPR and enhance user trust.
  3. Verify and update WHOIS domain registration information to improve transparency and legitimacy.
  4. Enhance accessibility features to improve usability for all users, including those with disabilities.
  5. Establish a security incident response contact and vulnerability disclosure policy to demonstrate security maturity.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
as4u.cz, s.r.o.
Description
Muzeum harmonik is a museum dedicated to harmonicas and accordions, showcasing historical instruments and information about them.
Key services
Exhibition of harmonicas and accordions, Visitor information, Event calendar
Content quality
good
Branding
consistent

Technology

Stack
jQuery, jQuery UI, SVG, JavaScript
Frameworks
Public4u CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • HTTPS usage assumed (URL is https)
  • No exposed sensitive data in HTML

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
moderate

Key observations

  1. Website is a cultural museum site focused on harmonicas and accordions.
  2. No WHOIS data available, which is unusual and reduces transparency.
  3. No explicit privacy, cookie, or terms of service policies found.
  4. Contact email is a company domain email (as4u.cz), indicating professional management.
  5. Social media presence limited to Facebook link.
  6. No analytics or tracking scripts detected in provided HTML.
  7. Website uses a custom CMS named Public4u.
  8. Site is accessible with no WAF or blocking detected.
  9. No security headers detected in HTML source; server headers unknown.
  10. No phone numbers or physical addresses explicitly found in HTML content.
Technical notes

Notes

The website is built on the Public4u CMS platform and uses common JavaScript libraries such as jQuery and jQuery UI. The site includes SVG graphics for interactive elements, indicating a moderate level of technical sophistication. The HTML structure is valid and includes meta tags for SEO, but lacks advanced SEO and accessibility features. Performance appears moderate; no explicit performance optimization scripts or CDN usage detected. Mobile optimization is good with responsive design elements. The absence of analytics or tracking scripts suggests minimal user tracking, which aligns with privacy best practices but also limits business intelligence capabilities.
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. 72/100Medium26 findingsView report
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