Skip to main content

Security report for onlinestar.cz

OnlineStar · Technology · Czech Republic

Medium risk. 9 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

56/100

Risk levelMedium

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

OnlineStar is a Czech-based technology company offering a suite of AI-powered digital marketing tools designed to enhance local SEO, reputation management, social media management, and website development. Launched in 2021 as a new brand under the experienced Mediatel group, OnlineStar targets small and medium businesses seeking to automate and optimize their marketing efforts through innovative AI solutions. Their platform includes AI chat assistants, local data management, review monitoring, social media content planning, and comprehensive reporting tools. The company maintains a professional web presence with consistent branding and active social media engagement.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 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

9 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 onlinestar.cz

This scan found 27 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.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
72
Security headers
15
Email security
70
DNS health
70
Network security
100
GDPR outside view
10
Average
56

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

OnlineStar positions itself as a modern SaaS provider in the digital marketing space, leveraging AI to differentiate from traditional marketing tools. Their business model is subscription-based, offering modular products that address key marketing pain points such as customer engagement, online visibility, and reputation management. The company benefits from the credibility and experience of its parent company Mediatel, which has a 30-year history in marketing services. The affiliate program and partner ecosystem indicate a growth-oriented strategy. Target customers are primarily Czech SMEs looking for accessible and effective marketing automation.

Security posture

The website enforces HTTPS with a valid SSL certificate, ensuring encrypted communications. However, it lacks several important security headers such as Content-Security-Policy and X-Frame-Options, which could mitigate risks like clickjacking and cross-site scripting. No exposed sensitive data or vulnerable libraries were detected in the HTML content. The absence of explicit privacy and cookie policies represents a compliance gap, especially under GDPR. No incident response or vulnerability disclosure information is provided, limiting transparency. Overall, the security posture is moderate but could be improved with standard best practices and compliance documentation.

Recommendations

  1. Implement and publish a comprehensive privacy policy and cookie consent mechanism to ensure GDPR compliance.
  2. Add standard security headers (Content-Security-Policy, X-Frame-Options, X-XSS-Protection) to enhance protection against common web attacks.
  3. Provide clear incident response and vulnerability disclosure contacts to improve transparency and trust.
  4. Regularly audit and update third-party scripts and SDKs to minimize security risks.
  5. Enhance accessibility features and conduct usability testing to improve user experience for all visitors.

Contact details published on the site

Addresses
Legal name
MEDIATEL CZ, s.r.o.
VAT number
CZ06554008
Registration number
06554008
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
OnlineStar
Description
Online Star nabízí revoluční nástroje s AI pro lokální SEO, správu recenzí a sociálních sítí. Usnadňuje a automatizuje marketing firem s cílem získat více zákazníků. Poskytuje nástroje jako AI chat asistenta, správu online reputace, sociální sítě, tvorbu webů a reporty online reputace.
Key services
AI Starforce (AI chat assistant), Local Star (local SEO and data management), Review Star (reputation and review management), Social Star (social media management with AI), Web Star (websites and e-shops), Report Online Reputace (online reputation reports)
Content quality
good
Branding
consistent

Technology

Stack
WordPress, Divi Theme, Google Tag Manager, Microsoft Clarity, Custom JavaScript, Google Fonts, AI Webchat SDK
Frameworks
WordPress CMS, Divi Theme Framework
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • No visible vulnerable libraries

Analytics and tracking

Services
Google Analytics (via GTM), Microsoft Clarity
Tracking level
moderate
Privacy practices
poor

Advertising

Tracking pixels
Microsoft Clarity
Marketing tools
AI Webchat, Microsoft Clarity
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 business-focused, professional, and well-structured.
  3. No explicit privacy or cookie policies found, indicating compliance gaps.
  4. Contact information is present but no email addresses explicitly listed.
  5. Multiple AI-powered marketing tools offered under a unified brand.
  6. Use of modern web technologies and analytics tools.
  7. No visible security headers; opportunity for security improvements.
  8. Affiliate program actively promoted.
  9. Social media presence on LinkedIn, Facebook, Instagram, YouTube.
Technical notes

Notes

The website is built on WordPress using the Divi theme framework, a popular and flexible CMS platform. It integrates modern web technologies including Google Tag Manager for analytics, Microsoft Clarity for user behavior tracking, and custom AI webchat SDKs for interactive customer engagement. The site is mobile responsive with good SEO metadata and structured data (JSON-LD) for enhanced search engine understanding. Performance is moderate, with room for optimization. The technical stack is mature but relies on third-party scripts that require ongoing security monitoring. Hosting provider details are not explicitly disclosed.
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. 56/100Medium35 findingsView report
Reviews of this site

Share your experience with onlinestar.cz. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review onlinestar.cz.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.