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Security report for gemius.com

Gemius · Media · Poland

Medium risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

68/100

Risk levelMedium

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

Gemius is a well-established international research and technology company specializing in digital and cross-media audience measurement, serving marketers and publishers with advanced marketing solutions. With over 20 years of experience, Gemius holds a leading market position in online and cross-media measurement, including Internet, TV, radio, and outdoor media. Their product portfolio includes audience data, marketing intelligence, campaign analytics, traffic measurement, real-time monitoring, ad serving, and user engagement visualization tools. The company targets media professionals and marketing agencies, operating primarily from Poland with a broad international footprint.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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

4 findings rated critical or high. Fix these first.

  1. 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 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';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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

  3. 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 gemius.com

This scan found 25 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

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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
67
Security headers
50
Email security
85
DNS health
55
Network security
100
GDPR outside view
53
Average
68

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 gemius.com, from OffSeq Breach.

Total records
911
Employees
10
Customers
797
Third parties
104
Weak passwords
18%

Latest record dated 2026-05-16 · 38 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for gemius.com.

Select it in the checkout above.

Masked preview

  • –shopmonitor.gemius.com2026-05-16
  • –prism.gemius.com2025-08-21
  • –gde.gemius.com2025-08-13
  • –e.gemius.com2025-08-13
  • –files.gemius.com2025-07-03

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)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

Gemius operates a B2B business model focused on providing data-driven insights and technology solutions for media measurement and marketing optimization. Their competitive advantage lies in their pioneering role and comprehensive cross-media measurement capabilities, including walled garden ecosystems. The company maintains partnerships with major global media and marketing agencies, enhancing its market reach and credibility. The website reflects a mature digital presence with multiple localized market versions, indicating strategic international expansion and customer segmentation. Revenue streams likely include subscription-based analytics services, campaign evaluation tools, and ad serving technologies.

Security posture

The website enforces HTTPS and uses asynchronous loading of proprietary tracking scripts, indicating a baseline security posture. However, the absence of DNSSEC, security headers, explicit cookie consent mechanisms, and published security or incident response policies suggests room for improvement in security maturity and compliance. No vulnerabilities or exposed sensitive data were detected in the provided content. The lack of a vulnerability disclosure policy or security.txt file limits transparency for security researchers. Overall, the security posture is moderate but could be enhanced to meet higher compliance and trust standards.

Recommendations

  1. Implement DNSSEC to enhance domain security and prevent DNS spoofing.
  2. Add standard security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Deploy a clear cookie consent banner/mechanism to comply with GDPR and privacy best practices.
  4. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  5. Consider establishing a vulnerability disclosure program or security.txt file to engage with the security community.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Gemius
Description
We are an international research and technology company providing digital and cross-media audience measurement and advanced marketing solutions. We have been developing solutions for over 20 years, pioneering online audience measurement and cross-media measurement including online, TV, radio, and outdoor.
Key services
Audience measurement (Internet, TV, radio, outdoor), Cross-media marketing intelligence, Post-evaluation analytics of campaigns, Web and app traffic measurement and analytics, Real-time campaign monitoring, Ad serving solutions, User engagement visualization
Content quality
excellent
Branding
consistent

Technology

Stack
Bootstrap 5.3.0, jQuery 3.6.0, AOS (Animate On Scroll), Custom JavaScript, Gemius proprietary tracking scripts
Frameworks
Bootstrap
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of async and defer in scripts

Analytics and tracking

Services
Gemius proprietary analytics
Tracking level
extensive
Privacy practices
basic

Advertising

Tracking pixels
Gemius tracking
Marketing tools
Gemius AdReal, Gemius Postbuy, Gemius Prism, Gemius Gde, Gemius AdOcean, Gemius Heatmap
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and content-rich.
  2. No visible forms collecting personal data on the homepage; contact form likely on contact page.
  3. No explicit cookie consent banner detected despite tracking scripts.
  4. Social media presence on LinkedIn and Facebook.
  5. No visible security.txt or vulnerability disclosure policy.
  6. WHOIS data supports legitimacy and long-term operation.
  7. No phone numbers or emails explicitly found in the HTML content provided.
  8. Multiple language/market versions available indicating international presence.
Technical notes

Notes

The website uses a modern front-end stack including Bootstrap 5.3.0 and jQuery 3.6.0, with additional libraries for animations and custom scripts. The presence of Gemius proprietary tracking and analytics scripts indicates a specialized technology infrastructure. The site is mobile responsive with good SEO meta tags and Open Graph data, supporting social sharing and discoverability. Performance is moderate, with asynchronous script loading improving page load times. Accessibility is basic but could be improved. No CMS or hosting provider details were identified from the content. Overall, the technical implementation is solid with opportunities for modernization and enhanced security.
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. 72/100 −6Medium30 findingsView report
  2. 78/100Low23 findingsView report
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