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Security report for stream.cz

Stream.cz · Media · Czech Republic

Medium risk. 8 critical or high findings in GDPR outside view and Security headers.

Security score

61/100

Risk levelMedium

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

Stream.cz is a prominent Czech online video streaming platform offering a wide range of original shows, series, and movies accessible both online and offline. It operates under the umbrella of Seznam.cz, a leading Czech internet company, which enhances its market credibility and reach. The platform targets a general audience with family-friendly content, including entertainment, news, recipes, and children's programming. Technically, the website employs modern JavaScript frameworks, integrates advanced analytics tools such as Gemius and Google Tag Manager, and maintains a fast, mobile-optimized user experience. Security-wise, the site enforces HTTPS and uses error monitoring services like Sentry, though explicit security headers and incident response policies are not publicly detailed. Privacy and cookie policies are comprehensive and GDPR-compliant, linked through Seznam.cz's legal pages. Overall, Stream.cz presents a professional, trustworthy, and well-maintained digital presence with room for improvement in transparency of security policies and WHOIS data availability.

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

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';…

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

Keep watching stream.cz

This scan found 23 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
95
Security headers
15
Email security
70
DNS health
75
Network security
100
GDPR outside view
10
Average
61

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

Stream.cz holds a strong position in the Czech media market as a leading online video portal, leveraging its parent company Seznam.cz's infrastructure and brand recognition. Its business model centers on free access to original and curated video content, monetized likely through advertising networks such as Sklik. The platform's extensive content library and mobile applications cater to diverse user segments, including families and general viewers. Strategic partnerships with related domains like televizeseznam.cz enhance its service offerings. The absence of public WHOIS data is mitigated by the reputable parent company association. Growth indicators include active content updates and integration of modern marketing and analytics tools, positioning Stream.cz competitively in the Czech digital media landscape.

Security posture

The website demonstrates a solid security posture with mandatory HTTPS encryption and integration of monitoring tools like Sentry for error tracking. While explicit security headers such as Content-Security-Policy or X-Frame-Options are not explicitly visible in the provided data, the overall implementation suggests adherence to standard security practices. No vulnerabilities or exposed sensitive data were detected in the HTML content. However, the lack of publicly available security policies, incident response contacts, or vulnerability disclosure mechanisms indicates areas for enhancement. Strengthening transparency around security governance and providing dedicated security contact channels would improve trust and compliance readiness.

Recommendations

  1. Publish explicit security headers and verify their implementation to enhance protection against common web attacks.
  2. Provide a dedicated security policy page and incident response contact information to improve transparency and readiness.
  3. Implement a security.txt file or vulnerability disclosure program to encourage responsible reporting of security issues.
  4. Enhance contact information availability, including business and security contacts, to support user trust and compliance.
  5. Regularly audit and update third-party scripts and analytics tools to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stream.cz
Description
Videoportál Stream.cz plný stovek originálních pořadů, seriálů a filmů dostupných online i offline.
Key services
Online video streaming, Original video content, Video on demand, Mobile applications
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React (implied by JSX-like code and SPA structure), Google Tag Manager, Gemius analytics, Sentry for error tracking, Seznam.cz proprietary scripts
Frameworks
Schema.org JSON-LD structured data
Platforms
Web, iOS (App Store link), Android (Google Play link)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of secure cookies (implied)
  • No exposed sensitive data in HTML
  • Use of Sentry for error monitoring

Analytics and tracking

Services
Gemius, Google Tag Manager, Sklik, Sentry
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Sklik
Tracking pixels
Gemius, Sklik, Seznam.cz tracking
Marketing tools
Sklik, Gemius
Transparency
good

Site quality

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

Key observations

  1. Website is a professional Czech online video streaming portal with extensive original content.
  2. Strong affiliation with Seznam.cz, a major Czech internet company.
  3. No WHOIS data available, possibly due to privacy or registry restrictions.
  4. Good use of modern web technologies and analytics.
  5. No security or privacy contact information explicitly provided on main site.
  6. Privacy and cookie policies are present and linked to Seznam.cz legal pages.
  7. No signs of adult or unsafe content.
  8. No WAF or blocking detected; site fully accessible.
Technical notes

Notes

Stream.cz utilizes a modern web technology stack with extensive use of JavaScript, likely React or similar SPA frameworks, and integrates multiple analytics and tracking services including Gemius, Google Tag Manager, and Sklik. The site is well-optimized for mobile devices and demonstrates fast loading performance. Structured data using Schema.org JSON-LD enhances SEO and content discoverability. Hosting details are not explicitly available, but the use of Seznam.cz domains for assets suggests internal hosting or CDN usage. The site shows no signs of technical debt or outdated libraries in the provided content. Opportunities exist to improve security header transparency and to document technical infrastructure more explicitly for compliance purposes.
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. 61/100 −2Medium32 findingsView report
  2. 63/100Medium29 findingsView report
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