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Security report for klett-gruppe.de

Die Klett Gruppe · Education · Germany

Medium risk. 4 critical or high findings in GDPR outside view and SSL/TLS.

Security score

66/100

Risk levelMedium

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

Die Klett Gruppe is a leading European educational company operating with over 90 subsidiaries across 24 countries. The company focuses on publishing educational media, adult and continuing education, and managing kindergartens and schools. Their website reflects a professional and consistent brand image, targeting educational institutions and partners. Technically, the site is built on TYPO3 CMS and uses modern JavaScript libraries such as jQuery, lodash, and FullPage.js, providing a moderate performance and good mobile optimization. Security-wise, the site enforces HTTPS and uses a cookie consent mechanism with Matomo analytics, but lacks explicit security policies and advanced security headers. Overall, the website is trustworthy and well-maintained, though improvements in security transparency and incident response readiness are recommended.

Scanned

NIS2 and GDPR posture

GDPR outside view
28/ 100 · High
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. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

  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

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

Keep watching klett-gruppe.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
72
Security headers
70
Email security
65
DNS health
60
Network security
100
GDPR outside view
28
Average
66

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

The Klett Gruppe holds a strong market position as a major educational service provider in Europe, with a diversified business model spanning publishing, adult education, and childcare. Their extensive subsidiary network supports broad geographic reach. The company leverages digital channels including social media to engage stakeholders. While revenue streams are not disclosed, the focus on education and media publishing suggests stable income from content sales and educational services. The website's multilingual support indicates an international audience. Strategic partnerships are implied but not explicitly detailed on the site. The company demonstrates a commitment to sustainability and corporate responsibility, enhancing its market reputation.

Security posture

The website demonstrates a baseline security posture with HTTPS and cookie consent for analytics. However, the absence of security headers such as Content Security Policy, HSTS, and X-Frame-Options reduces defense-in-depth. No incident response or vulnerability disclosure policies are published, which may hinder timely handling of security events. The use of third-party libraries requires ongoing monitoring to avoid vulnerabilities. No exposed sensitive data or obvious security flaws were detected in the HTML content. Overall, the security maturity is moderate but could benefit from formalized policies and enhanced technical controls.

Recommendations

  1. Implement comprehensive security headers including CSP, HSTS, and X-Frame-Options to strengthen browser security.
  2. Publish clear security and incident response policies accessible from the website to improve transparency and readiness.
  3. Introduce a vulnerability disclosure program or security.txt file to facilitate responsible reporting of security issues.
  4. Regularly update and audit third-party libraries to mitigate risks from known vulnerabilities.
  5. Enhance accessibility features and mobile optimization to improve user experience and compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Die Klett Gruppe
Description
Die Klett Gruppe ist ein führendes Bildungsunternehmen in Europa und ist mit über 90 Tochterunternehmen in 24 Ländern vertreten.
Key services
Verlage und Bildungsmedien, Erwachsenen- und Weiterbildung, Kindertagesstätten und Schulen
Content quality
good
Branding
consistent

Technology

Stack
jQuery 3.2.1, lodash, FullPage.js, fancybox, Slick slider, Bootstrap, PerfectScrollbar, Isotope
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced (implied by canonical URL https://)
  • Cookie consent banner with opt-in/out

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Matomo
Transparency
basic

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is primarily in German with English alternate available.
  3. Strong focus on education sector with multiple business areas.
  4. Cookie consent is implemented with Matomo analytics.
  5. No explicit security or incident response policies found.
  6. No exposed sensitive data or obvious vulnerabilities detected.
  7. Social media presence is active on major platforms.
  8. No direct contact emails or phone numbers found in HTML; contact via form only.
  9. No terms of service page detected.
  10. No security.txt or vulnerability disclosure found.
Technical notes

Notes

The website is built on TYPO3 CMS, a robust open-source content management system, and utilizes a modern JavaScript stack including jQuery, lodash, FullPage.js, and Bootstrap for UI components. The site includes responsive design elements and a cookie consent mechanism integrated with Matomo analytics. Performance is moderate, with multiple CSS and JS assets loaded. The site lacks visible advanced SEO structured data such as JSON-LD but uses Open Graph tags for social sharing. Hosting provider details are not disclosed. There is room for technical optimization in accessibility and security header implementation to reduce technical debt and improve resilience.
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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