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Security report for nielsen.com

Nielsen · Media · N/a

Low risk. 3 critical or high findings in Security headers and SSL/TLS.

Security score

76/100

Risk levelLow

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

Nielsen is a globally recognized leader in audience insights, data, and analytics, specializing in media measurement and shaping the future of media consumption understanding. The company offers a comprehensive suite of services including audience measurement, media planning, marketing optimization, and content metadata solutions, targeting media companies, advertisers, and marketers worldwide. The website reflects a mature digital presence with multi-language support, strong SEO, and professional branding consistent with an enterprise-level organization. Technically, the site is built on WordPress with modern technologies such as Yoast SEO, Google Tag Manager, and OneTrust for privacy compliance. The infrastructure supports good performance, mobile optimization, and accessibility. Security posture is strong with HTTPS enforced, security headers present, and no visible vulnerabilities or exposed sensitive data. Privacy compliance is robust, featuring comprehensive privacy and cookie policies with geolocation-based consent mechanisms. The WHOIS data is unavailable or obscured, which is common for large enterprises to protect registrant privacy. Despite this, the website's content, branding, and external references strongly support its legitimacy. No WAF or blocking mechanisms interfere with content access, allowing full analysis. Overall, Nielsen's website demonstrates a high level of professionalism, security, and compliance, supporting its position as a trusted global media analytics provider.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 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

3 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

  2. 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
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching nielsen.com

This scan found 19 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
42
Security headers
40
Email security
98
DNS health
85
Network security
100
GDPR outside view
88
Average
76

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

Nielsen holds a dominant market position in media measurement and analytics, serving a broad range of clients including broadcasters, advertisers, and marketers. Its business model revolves around providing data-driven insights to optimize media planning and marketing strategies. The company leverages a global footprint with multi-language support and a marketplace for data access, indicating a diversified revenue stream. Strategic partnerships and a strong social media presence enhance its ecosystem. The website content and structure reflect a mature enterprise with consistent branding and trust signals such as privacy compliance and secure infrastructure.

Security posture

The website exhibits a mature security posture with enforced HTTPS, multiple security headers, and no detected vulnerabilities in the client-side code. Privacy and cookie policies are comprehensive and GDPR compliant, supported by OneTrust consent management. However, the absence of a public vulnerability disclosure policy or security.txt file and lack of explicit incident response contact information represent areas for improvement. The site does not expose sensitive data and uses modern libraries without known vulnerabilities. Overall, the security maturity is high but could benefit from enhanced transparency and formal disclosure mechanisms.

Recommendations

  1. Publish a public vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  2. Provide clear incident response contact channels to improve security communication.
  3. List relevant security certifications and compliance frameworks on the trust or about pages.
  4. Regularly review and audit third-party scripts and plugins for security vulnerabilities.
  5. Enhance transparency on data retention and processing policies to strengthen privacy trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Nielsen
Description
A global leader in audience insights, data and analytics, Nielsen shapes the future of media with accurate measurement of what people listen to and watch.
Key services
Audience measurement, Media planning, Marketing optimization, Content metadata, Digital measurement, Cross-media measurement
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, Yoast SEO Premium, Google Tag Manager, jQuery, WooCommerce, OneTrust Cookie Consent, Google Analytics (gtag.js), Ninja Forms, AB Tasty
Frameworks
Alpine.js
Platforms
WordPress
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with geolocation
  • No exposed sensitive data in HTML
  • Use of security headers
  • No visible vulnerable libraries

Analytics and tracking

Services
Google Analytics, WordPress Stats
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
WordPress Stats
Marketing tools
AB Tasty
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 no blocking or WAF challenges.
  2. Content is rich, professional, and well-structured.
  3. Strong privacy and cookie compliance mechanisms in place.
  4. Use of modern web technologies and SEO best practices.
  5. No exposed security vulnerabilities detected in source.
  6. WHOIS data unavailable, but website legitimacy is high based on content and branding.
  7. Multiple language versions available indicating global presence.
  8. Social media presence is verified and consistent.
Technical notes

Notes

The website is powered by WordPress CMS with a modern tech stack including Yoast SEO for search optimization, Google Tag Manager for analytics, and OneTrust for privacy compliance. It uses Alpine.js for interactive UI elements and integrates WooCommerce components, indicating e-commerce capabilities. Performance is moderate with good mobile responsiveness and accessibility features. The site employs multiple CDN and analytics services, ensuring scalability and data-driven insights. Technical risks are minimal, but continuous monitoring of third-party dependencies is advised to mitigate potential vulnerabilities.
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. 46/100High26 findingsView report
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