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Security report for o2arena.cz

Bestsport, a.s. · Hospitality · Czech Republic

Low risk. 1 critical or high finding in SSL/TLS.

Security score

78/100

Risk levelLow

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

O2 arena, operated by Bestsport, a.s., is a premier multifunctional venue and convention center located in Prague, Czech Republic. It offers a diverse program of cultural and sporting events and provides rental spaces for various types of events. The venue is well-positioned in the hospitality and entertainment sectors, supported by a strong brand presence and partnerships with reputable companies including its parent company PPF Group. The website reflects a mature digital infrastructure built on WordPress, leveraging modern JavaScript libraries and analytics tools to deliver a fast, accessible, and user-friendly experience. Privacy compliance is robust with a detailed cookie consent mechanism and a comprehensive privacy policy. Security posture is strong with HTTPS enforced and no obvious vulnerabilities detected, though some security headers could be improved. Overall, the domain appears legitimate despite the absence of WHOIS data, likely due to privacy protection, and the site maintains high trust and professionalism.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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

1 finding rated critical or high. Fix these first.

  1. 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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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

Keep watching o2arena.cz

This scan found 20 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
62
Security headers
85
Email security
60
DNS health
80
Network security
100
GDPR outside view
83
Average
78

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 o2arena.cz, from OffSeq Breach.

No leaked records found

Breach holds no records for o2arena.cz right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

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 O2 arena operates in the hospitality and entertainment industry, targeting a broad audience including event attendees, sports fans, and cultural enthusiasts. Its business model centers on venue management, event hosting, and space rental, generating revenue through ticket sales and partnerships. The company benefits from a strong ecosystem of subsidiaries and partners, including O2 Universum and STAGES HOTEL Prague, enhancing its market reach. The website's content and branding are consistent and professional, supporting a high level of business credibility. The presence of multiple social media channels and partner logos indicates active engagement and a well-established market position.

Security posture

The website demonstrates a solid security foundation with HTTPS enabled and a cookie consent mechanism that respects user privacy preferences. The use of Google Tag Manager and Facebook Pixel is managed with consent controls. However, explicit security headers such as X-Frame-Options and X-Content-Type-Options are not visibly configured in the HTML, representing an area for improvement. No exposed sensitive data or vulnerable libraries were detected. The absence of a published security policy or incident response contact limits transparency in security governance. Overall, the security posture is good but could be enhanced by publishing formal policies and tightening HTTP headers.

Recommendations

  1. Implement and publish explicit security headers including X-Frame-Options and X-Content-Type-Options to mitigate clickjacking and MIME sniffing risks.
  2. Create and publish a dedicated security policy page outlining security practices and incident response procedures to improve transparency and trust.
  3. Provide clear incident response contact channels such as security@ or abuse@ email addresses for reporting security issues.
  4. Regularly audit and update third-party scripts and plugins to minimize vulnerabilities and ensure compliance with latest security standards.
  5. Enhance privacy compliance by including a terms of service page and ensuring all legal documents are easily accessible and up to date.

Contact details published on the site

Addresses
Legal name
Bestsport, a.s.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Bestsport, a.s.
Description
A unique convention center and multifunctional venue in Prague. We offer a program full of culture and sports, with the option to rent spaces for your own event.
Key services
Event hosting (concerts, sports, shows), Space rental for events, Club floor and skyboxes rental, Ticket sales facilitation
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, jQuery, Splide.js, Google Tag Manager, Google Analytics, Facebook Pixel, Tiny Slider, Magnific Popup, 3D Flipbook plugin
Platforms
WordPress CMS
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

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

Analytics and tracking

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

Advertising

Ad networks
Google Adsense
Tracking pixels
Facebook Pixel
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and no blocking detected
  2. Comprehensive cookie consent mechanism implemented with opt-in and detailed cookie categories
  3. Strong use of structured data (JSON-LD) for SEO and business information
  4. Multiple social media and partner links indicating active business presence
  5. No exposed sensitive data or obvious security misconfigurations in HTML
  6. WHOIS data unavailable, likely due to privacy protection
  7. No explicit security or incident response policies published
  8. No terms of service page clearly found
  9. Good SEO and accessibility practices observed
Technical notes

Notes

The website is built on WordPress CMS with a modern tech stack including jQuery, Splide.js for sliders, Tiny Slider, and Magnific Popup for UI components. Google Tag Manager and Google Analytics are used for analytics and tracking, with Facebook Pixel integrated for marketing. The site is optimized for performance with preloaded images and lazy loading. Mobile optimization and accessibility are well addressed. The site uses structured data (JSON-LD) for SEO and business information. Hosting provider details are not explicitly found. Overall, the technical infrastructure is modern, performant, and well maintained, supporting a professional online presence.
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. 79/100Low27 findingsView report
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