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Security report for cornelsen.de

Cornelsen Verlag GmbH · Education · Germany

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

Security score

82/100

Risk levelLow

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

Cornelsen Verlag GmbH is a well-established German educational publisher specializing in school books, workbooks, and teaching materials for learners and educators. The website reflects a mature digital presence with a comprehensive navigation structure covering various educational sectors including primary, secondary, vocational, and adult education. The company leverages modern web technologies such as Neos CMS and Flow PHP framework, hosted on AWS infrastructure, and integrates multiple analytics and marketing tools including Google Tag Manager, Econda, Microsoft Clarity, and social media platforms. Security measures are robust with HTTPS enforcement and a strict Content-Security-Policy, although explicit privacy and cookie policies are not clearly found in the analyzed content. The site is free from WAF blocks or security challenges, indicating full accessibility.

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 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 cornelsen.de

This scan found 18 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

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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
77
Security headers
80
Email security
80
DNS health
70
Network security
100
GDPR outside view
83
Average
82

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

Cornelsen Verlag holds a strong market position in the German education sector, targeting learners and educators with a broad portfolio of educational media. Their business model centers on publishing and selling educational content, supported by digital media offerings. The company maintains active social media channels and uses advanced analytics and marketing tools to engage its audience. The website's structure and content quality suggest a large enterprise with consistent branding and professional presentation. No suspicious or privacy-protected WHOIS data was found, supporting legitimacy. However, the absence of explicit privacy and security policy disclosures may be an area for improvement to align with GDPR and industry best practices.

Security posture

The website demonstrates a solid security posture with HTTPS enabled and a comprehensive Content-Security-Policy that restricts resource loading and mitigates common web vulnerabilities. No exposed sensitive data or vulnerable libraries were detected in the provided content. However, the lack of publicly available incident response contacts or vulnerability disclosure mechanisms limits transparency and readiness perception. The security score is high but could be improved by publishing clear security policies and response procedures. Overall, the site follows good security best practices but should enhance compliance and communication aspects.

Recommendations

  1. Publish a clear and accessible privacy policy and cookie policy to improve GDPR compliance and user trust.
  2. Implement and publicize an incident response and vulnerability disclosure page or security.txt file.
  3. Regularly review and update third-party scripts and tracking tools to minimize privacy risks.
  4. Enhance transparency by providing data retention policies and user data handling information.
  5. Consider obtaining and displaying recognized security certifications or compliance badges.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Cornelsen Verlag GmbH
Description
Der Cornelsen Verlag bietet Bildungsmedien wie Schulbücher, Arbeitshefte und Materialien für den Unterricht für Lernende und Lehrende.
Key services
Educational media publishing, School books, Workbooks, Teaching materials
Content quality
excellent
Branding
consistent

Technology

Stack
PHP, Neos CMS, Flow Framework, Google Tag Manager, Econda Analytics, Microsoft Clarity, Facebook Connect, Pinterest, Trbo
Frameworks
Flow PHP Framework, Neos CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • Strict Content-Security-Policy
  • HTTPS enforced
  • No object-src allowed
  • Use of nonce and hashes in CSP

Analytics and tracking

Services
Econda, Microsoft Clarity, Google Analytics (implied via GTM)
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
Google DoubleClick, Bing Ads, Facebook Ads
Tracking pixels
Econda, Microsoft Clarity, Facebook Pixel, Pinterest, Trbo
Marketing tools
Trbo
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 rich content
  2. Professional educational publishing site targeting German market
  3. Strong use of modern web technologies and analytics
  4. Good security posture with CSP and HTTPS
  5. Lacks explicit privacy, cookie, and terms of service pages in analyzed content
  6. No visible incident response or vulnerability disclosure information
  7. Comprehensive navigation structure covering multiple educational sectors
  8. Social media presence well integrated
Technical notes

Notes

The website is built on the Neos CMS platform using the Flow PHP framework, hosted on AWS infrastructure. It employs modern front-end technologies and integrates multiple third-party analytics and marketing services. The site is mobile-optimized and accessible, with good SEO practices including meta tags and structured data. Performance is moderate, likely influenced by the extensive use of external scripts and tracking pixels. The technical stack is modern and well-maintained, but the site could benefit from performance optimization and reducing reliance on multiple tracking services to enhance privacy and speed.
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

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