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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

72/100

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, publishers, and media agencies. With over 20 years of experience and a pioneering position in online audience measurement, Gemius offers a comprehensive portfolio of products covering online, TV, radio, and outdoor media. The company targets B2B clients seeking advanced marketing intelligence and analytics solutions. Technically, the website employs modern frameworks such as Bootstrap and jQuery, with proprietary tracking scripts for analytics and heatmaps. The site is professionally designed, mobile-optimized, and SEO-friendly, though some accessibility features could be improved. Security posture is solid with HTTPS enabled and no exposed sensitive data, but lacks DNSSEC and security headers, and does not provide explicit security or incident response policies. Privacy compliance is partially addressed with a comprehensive privacy policy but lacks a cookie consent mechanism. Overall, the domain registration data supports the legitimacy and long-standing presence of the company.

Scanned

This is an earlier scan of gemius.com. View the latest report

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 22 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.

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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
75
Network security
100
GDPR outside view
53
Average
72

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 holds a strong market position as a leader in audience measurement and cross-media analytics, leveraging its long history and technological expertise. Its business model focuses on providing data-driven insights and marketing tools to media professionals and advertisers. The company maintains partnerships with major media agencies and brands, enhancing its credibility and reach. The website content and product portfolio reflect a mature and focused business strategy, emphasizing transparency and innovation in media measurement. Growth potential is supported by continuous product development and geographic market coverage across multiple countries.

Security posture

The website demonstrates a moderate to good security maturity level with HTTPS enforced and no visible sensitive data leaks. However, the absence of DNSSEC and security headers such as Content-Security-Policy and X-Frame-Options indicates room for improvement. No vulnerability disclosure or security policy pages were found, which could hinder incident response transparency. The use of proprietary tracking scripts suggests control over data collection, but privacy compliance could be enhanced by implementing explicit cookie consent mechanisms. Overall, the security posture is adequate for the business type but would benefit from adopting additional best practices and formal policies.

Recommendations

  1. Enable DNSSEC to improve domain security and prevent DNS spoofing.
  2. Implement security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Add a cookie consent banner to comply fully with GDPR and enhance user privacy transparency.
  4. Publish a dedicated security policy and incident response contact information to improve trust and readiness.
  5. Consider establishing a vulnerability disclosure policy and hosting a security.txt file to encourage responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Gemius
Description
Gemius is an international research and technology company providing digital and cross-media audience measurement and advanced marketing solutions. They offer single-source research for all media including online, TV, radio, and outdoor, with over 20 years of experience and a focus on cross-media measurement since 2018.
Key services
Audience measurement (online, TV, radio, outdoor), Cross-media marketing intelligence, Post-evaluation analytics of campaigns, Web and app traffic measurement, 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, 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 enabled
  • No exposed sensitive data in HTML
  • Use of async and defer for scripts

Analytics and tracking

Services
Gemius 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 explicit privacy or cookie consent banner detected.
  3. No visible phone numbers or email addresses on homepage; contact via contact page.
  4. Social media presence on LinkedIn and Facebook confirmed.
  5. Use of proprietary tracking scripts by Gemius for analytics and heatmap.
  6. No visible security.txt or vulnerability disclosure policy.
  7. No security headers detected in provided data; DNSSEC not enabled.
  8. Domain registration is stable and consistent with business claims.
Technical notes

Notes

The website uses a modern and stable technology stack centered on Bootstrap 5 and jQuery 3.6, ensuring responsive design and compatibility. Custom JavaScript and proprietary Gemius tracking scripts are used for analytics and user engagement visualization. Performance is moderate with asynchronous script loading, but no explicit CMS or hosting provider information is available. SEO is well addressed through meta tags and Open Graph data. Accessibility is basic and could be improved with ARIA roles and enhanced keyboard navigation. Overall, the technical implementation supports the business goals effectively but could benefit from modernization in accessibility and security features.
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. 68/100 −10Medium33 findingsView report
  2. 78/100Low23 findingsView report
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