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Security report for stroeerdigitalgroup.de

STRÖER · Media · Germany

Low risk. 1 critical or high finding in SSL/TLS.

Security score

80/100

Risk levelLow

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

STRÖER is a leading German media and advertising company specializing in digital advertising solutions across multiple channels including display, video, native, mobile, and programmatic advertising. The website demonstrates a strong market position with a comprehensive portfolio of services targeting advertisers seeking data-driven marketing strategies. Technically, the site is built on TYPO3 CMS, uses Matomo for analytics with privacy-conscious configurations, and employs Cookiebot for GDPR-compliant cookie consent management. The hosting and DNS are managed via Cloudflare, enhancing security and performance. Security posture is solid with HTTPS enforced and privacy compliance well implemented, though explicit security policies and incident response contacts are not publicly available. Overall, the site is professional, trustworthy, and well-optimized for user experience and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 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

1 finding rated critical or high. Fix these first.

  1. 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 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

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Keep watching stroeerdigitalgroup.de

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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
75
Security headers
85
Email security
70
DNS health
65
Network security
100
GDPR outside view
83
Average
80

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 stroeerdigitalgroup.de, from OffSeq Breach.

No leaked records found

Breach holds no records for stroeerdigitalgroup.de right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

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

STRÖER operates in the media sector with a focus on digital advertising, leveraging a broad portfolio of premium brands and content verticals. Their business model centers on providing advertisers with targeted, high-impact advertising solutions supported by proprietary data and technology stacks. The company targets marketers and brands looking for comprehensive digital reach and engagement. The website reflects a mature digital presence with strong branding consistency and trust signals such as GDPR compliance and transparent cookie management. Partnerships with data providers like OS Data Solutions and EQS Group indicate a robust ecosystem supporting their offerings. The absence of direct contact emails but presence of contact forms suggests a controlled communication channel. The company appears enterprise-sized with a significant market footprint in Germany.

Security posture

The website demonstrates a good security posture with HTTPS enabled and use of Cloudflare DNS, which likely provides additional security layers. Cookie consent is managed via Cookiebot with blocking mode enabled, and Matomo analytics respects Do Not Track settings, indicating privacy-aware practices. However, explicit security headers such as Content-Security-Policy or X-Frame-Options are not confirmed in the provided data. No public security policy or incident response contacts are found, which is a gap in transparency and readiness. No vulnerabilities or exposed sensitive data were detected in the HTML content. The site would benefit from publishing a vulnerability disclosure policy and enhancing security header implementation to further strengthen its security maturity.

Recommendations

  1. Implement and explicitly confirm security headers like Content-Security-Policy, X-Frame-Options, and Referrer-Policy to enhance protection against common web attacks.
  2. Publish a clear security policy and incident response contact information to improve transparency and readiness for security incidents.
  3. Consider adding a vulnerability disclosure or security.txt file to encourage responsible reporting of security issues.
  4. Regularly audit third-party scripts and integrations to ensure no vulnerable libraries or privacy risks are introduced.
  5. Maintain and update cookie consent mechanisms to comply with evolving privacy regulations and user expectations.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
STRÖER
Description
Ströer bietet vielfältige Werbelösungen für digitale Markenkommunikation, inklusive Display, Video, Native Ads, Mobile, Audio und Programmatic, mit datengetriebenen Strategien und großer Reichweite.
Key services
Online advertising, Display advertising, Video advertising, Native advertising, Mobile advertising, Programmatic advertising, Data-driven marketing strategies
Content quality
excellent
Branding
consistent

Technology

Stack
TYPO3 CMS, Matomo Analytics, Cookiebot Consent Management, Cloudflare DNS and likely CDN
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with blocking mode
  • Do Not Track enabled in analytics
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Matomo Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
YouTube
Tracking pixels
Cookiebot pixel, Matomo tracking pixel
Marketing tools
Cookiebot, Matomo Analytics
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. Strong compliance with GDPR and cookie consent requirements.
  3. Professional and comprehensive content focused on digital advertising.
  4. Use of modern CMS TYPO3 and analytics tools with privacy considerations.
  5. No direct contact emails or phone numbers found; contact via form only.
  6. No explicit security or incident response policies published.
  7. No vulnerability disclosure or security.txt found.
  8. No suspicious or malicious content detected.
Technical notes

Notes

The website is built on TYPO3 CMS, a mature and extensible content management system, indicating a solid technical foundation. It uses Matomo Analytics for privacy-focused user tracking and Cookiebot for consent management, reflecting compliance with GDPR. Hosting and DNS are managed via Cloudflare, providing performance and security benefits. The site is mobile-optimized with responsive design and good accessibility features. Performance is moderate, likely due to the use of compressed CSS and optimized images. SEO is supported by proper meta tags, Open Graph tags, and canonical links. The technical stack is modern and well-integrated, though opportunities exist to enhance security headers and publish more explicit security documentation.
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. 80/100Low27 findingsView report
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