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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 digital media and advertising company in Germany, offering a wide range of online advertising solutions including display, video, native ads, and programmatic advertising. The company targets advertisers seeking broad digital reach across multiple channels and platforms. Their website demonstrates a mature digital infrastructure using TYPO3 CMS, integrated with Matomo analytics and Cookiebot for GDPR-compliant consent management. Security posture is solid with HTTPS and privacy mechanisms, though explicit security policies and incident response contacts are not publicly disclosed. Overall, the website is professional, well-structured, and compliant with privacy regulations, reflecting a trustworthy and established business presence.

Scanned

This is an earlier scan of stroeerdigitalgroup.de. View the latest report

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 holds a strong market position as Germany's number one digital marketer with a large portfolio of websites and a monthly reach of 49 million unique users. Their business model focuses on providing advertisers with high-impact digital advertising products across various media types. The company leverages partnerships such as OS Data Solutions for premium targeting data and EQS Group for legal compliance. The website content and structure indicate a focus on quality, brand safety, and innovative advertising formats, supporting growth and competitive advantage in the digital advertising sector.

Security posture

The website employs HTTPS with good SSL configuration and uses Cookiebot for consent management, indicating compliance with GDPR. Analytics are handled via Matomo with Do Not Track enabled, reducing privacy risks. However, no explicit security policy or incident response information is found, and security headers are not explicitly detected in the provided data. There is no evidence of vulnerability disclosure programs or security.txt files. Overall, the security posture is good but could be improved by publishing formal security policies and enhancing HTTP security headers.

Recommendations

  1. Implement and publish a formal security policy and incident response contact information on the website.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to enhance protection.
  3. Consider establishing a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Regularly audit third-party scripts and dependencies to mitigate potential vulnerabilities.
  5. Enhance transparency by providing direct contact details such as security or abuse email addresses.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
STRÖER
Description
Ströer is Germany's number 1 digital marketer with a monthly reach of 49 million unique users. They offer a broad portfolio of over 1,600 websites including general interest, sports, and special interest domains. Their services include digital advertising solutions such as display, video, audio, native ads, and programmatic advertising, aiming to increase brand presence with data-driven strategies.
Key services
Online advertising, Display ads, Video ads, Native advertising, Programmatic advertising, Mobile marketing, Audio advertising, Data-driven targeting
Content quality
excellent
Branding
consistent

Technology

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

Security

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

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
YouTube
Tracking pixels
Matomo
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 via Cookiebot consent management.
  3. Professional and comprehensive privacy and cookie policies present.
  4. No direct contact emails or phone numbers found on this page; contact is via form.
  5. Use of modern CMS TYPO3 and analytics via Matomo indicates good technical maturity.
  6. No explicit security policy or incident response information found.
  7. No vulnerability disclosure or security.txt file detected.
  8. Content is business-focused, safe, and suitable for general audiences.
  9. External links mostly to trusted partners and service providers.
Technical notes

Notes

The website is built on TYPO3 CMS, a robust and widely used content management system. It integrates Matomo analytics for privacy-friendly tracking and Cookiebot for consent management, demonstrating a modern and privacy-conscious tech stack. Hosting and DNS are managed via Cloudflare, providing performance and security benefits. The site is mobile-optimized with responsive design and good accessibility features. SEO is supported by proper meta tags and multilingual hreflang attributes. Performance is moderate, with compressed CSS assets and asynchronous loading of scripts. Overall, the technical infrastructure is solid with opportunities for further security hardening.
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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