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Security report for periodensystem.de

Elementare Vielfalt · Education · Germany

High risk. 8 critical or high findings in GDPR outside view, Email security and 2 other checks.

Security score

49/100

Risk levelHigh

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

The website www.periodensystem.de is a specialized educational platform offering a free interactive periodic table of elements aimed at students and professionals in chemistry-related fields. It is positioned as a niche resource within the German education sector, providing accessible and app-free learning tools. The site is powered by TYPO3 CMS and leverages modern JavaScript libraries to enhance user experience. Hosting is provided by SchlundTech, a reputable German hosting provider, ensuring reliable infrastructure. The site demonstrates good technical maturity with responsive design and SEO optimization. Security posture is solid with HTTPS enforced and GDPR-compliant cookie consent managed via Usercentrics, although some security headers are missing and no explicit security policies or incident response contacts are provided. Overall, the site is trustworthy, safe, and professionally maintained, with room for improvement in transparency and security documentation.

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

8 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

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  3. 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"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

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

Keep watching periodensystem.de

This scan found 26 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

Email alerts on material changes and an exportable JSON history of every change.

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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
52
Security headers
55
Email security
60
DNS health
60
Network security
40
GDPR outside view
28
Average
49

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

Elementare Vielfalt operates as a small educational entity focused on chemistry education, targeting students in school, vocational training, and higher education. The business model is based on providing free digital educational content without monetization through ads or affiliate programs. The partnership with www.elementare-vielfalt.de suggests a broader ecosystem supporting chemical industry education and training. The site’s clean branding, consistent messaging, and social media presence support its credibility. Growth potential lies in expanding educational offerings and enhancing user engagement. The absence of direct contact information may limit user trust and support capabilities.

Security posture

The website maintains a good security baseline with HTTPS and GDPR-compliant cookie consent mechanisms. The use of Usercentrics ensures user privacy preferences are respected and third-party services are blocked until consent is given. However, the lack of security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options reduces defense-in-depth. No vulnerability disclosure or incident response information is provided, which could hinder timely reporting and mitigation of security issues. No exposed sensitive data or vulnerable libraries were detected. Overall, the security posture is adequate for an educational site but could be enhanced by implementing additional headers and transparency measures.

Recommendations

  1. Implement standard security headers including CSP, HSTS, X-Frame-Options, and X-XSS-Protection to strengthen browser security.
  2. Publish a security policy and incident response contact information to improve transparency and user trust.
  3. Consider adding a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  4. Add clear business contact information to enhance credibility and user support.
  5. Regularly audit third-party libraries and dependencies to ensure no vulnerabilities are introduced.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Elementare Vielfalt
Description
Unser Periodensystem der Elemente (PSE) ist dein perfekter Begleiter für Schule, Ausbildung, Studium und Beruf: Kostenfrei und ohne App-Download!
Key services
Interactive periodic table web app, Educational content for chemistry students
Content quality
good
Branding
consistent

Technology

Stack
TYPO3 CMS, jQuery 3.7.1, jQuery UI, Lity (lightbox), Slick carousel, LightGallery, Usercentrics (consent management), FontAwesome
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced (canonical URL uses https)
  • Cookie consent management implemented
  • Blocking of third-party services before consent

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
Usercentrics
Marketing tools
Usercentrics consent management
Transparency
basic

Site quality

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

Key observations

  1. Website is a free educational resource for chemistry students.
  2. Uses modern CMS TYPO3 with multiple JS libraries for UI/UX.
  3. Implements GDPR-compliant cookie consent via Usercentrics.
  4. No direct contact emails or phone numbers found on main site.
  5. No visible security.txt or vulnerability disclosure policy.
  6. No terms of service page detected.
  7. Social media presence limited to Facebook and Instagram.
  8. No advertising networks detected beyond consent management.
  9. No signs of adult or questionable content.
Technical notes

Notes

The website is built on TYPO3 CMS, a mature and secure content management system, combined with modern JavaScript libraries such as jQuery, Slick carousel, and LightGallery to provide interactive and multimedia features. The site is hosted on SchlundTech, a German hosting provider, which aligns with the site's German language and target audience. Performance is moderate with video backgrounds and multiple CSS/JS assets, but mobile optimization is good. SEO is supported by proper meta tags and Open Graph data. Accessibility is basic but could be improved. No critical technical debt or outdated technologies were detected. Overall, the technical infrastructure supports the site's educational mission effectively.
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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