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Security report for tandem-schools.com

TANDEM Language Schools · Education · Germany

Medium risk. 6 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

59/100

Risk levelMedium

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

TANDEM Language Schools is a non-profit association of independent language schools offering German and Spanish courses primarily in Germany, Spain, and Chile. The organization focuses on immersive language learning combined with cultural experiences, targeting language learners interested in these regions. The website is built on TYPO3 CMS and hosted by Hetzner Online GmbH, reflecting a moderate level of digital maturity with a clean, professional design and multilingual support. Security posture is adequate with HTTPS enabled but lacks advanced security headers and DNSSEC, indicating room for improvement. Privacy compliance is partial with a privacy policy present but no cookie consent mechanism detected. Overall, the website is trustworthy and functional but could enhance security and privacy features to align with best practices.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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

6 findings rated critical or high. Fix these first.

  1. 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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';…

  2. GDPR outside view

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

    • 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

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

Keep watching tandem-schools.com

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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
100
Security headers
25
Email security
70
DNS health
85
Network security
20
GDPR outside view
53
Average
59

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 tandem-schools.com, from OffSeq Breach.

No leaked records found

Breach holds no records for tandem-schools.com 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

The business operates as a language school network with a focus on quality and cultural immersion, serving a niche market of language learners in Europe and South America. Its non-profit status and regional presence provide competitive advantages in authenticity and local adaptation. The business model relies on member schools offering courses independently under shared quality standards. The absence of direct contact emails or phone numbers on the main pages suggests a centralized contact approach via forms. Social media channels support marketing and community engagement. Growth potential exists through expanding digital presence and enhancing compliance with privacy regulations.

Security posture

The website demonstrates basic security hygiene with HTTPS enabled and no visible exposed sensitive data. However, the lack of DNSSEC, security headers, and explicit incident response or security policy pages indicates a moderate security maturity level. No vulnerabilities or malware indicators were found in the content. The absence of cookie consent mechanisms may pose GDPR compliance risks. The organization should prioritize implementing security headers, DNSSEC, and formalizing incident response contacts to strengthen its security posture.

Recommendations

  1. Enable DNSSEC on the domain to protect against DNS spoofing and improve domain security.
  2. Implement standard security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Add a cookie consent banner or mechanism to comply with GDPR and enhance user privacy transparency.
  4. Publish a dedicated security policy and incident response contact information to improve trust and readiness.
  5. Regularly audit third-party scripts and libraries to ensure no vulnerabilities are introduced.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
TANDEM Language Schools
Description
Deutsch und Spanisch lernen mit TANDEM Language Schools, ein deutsch-spanischer Sprachschulverband mit unabhängigen und gemeinnützigen Sprachschulen in Deutschland, Spanien und Chile. Fokus auf lebendigen, professionellen Sprachunterricht, interkulturelle Begegnungen und individuelle Entwicklung.
Key services
Deutschkurse in Deutschland, Spanischkurse in Spanien, Spanischkurse in Chile
Content quality
good
Branding
consistent

Technology

Stack
TYPO3 CMS, Bootstrap, jQuery, Fancybox, JustifiedGallery
Frameworks
TYPO3
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
65/100
Good practices seen
  • HTTPS enabled

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is fully accessible and not blocked by WAF or security mechanisms.
  2. Content is primarily in German with language options for English and Spanish.
  3. No explicit privacy or cookie consent banner detected, though privacy policy page exists.
  4. No direct company contact emails or phone numbers found in the visible content.
  5. Social media presence is established on Facebook, Instagram, YouTube, and Twitter.
  6. Website uses TYPO3 CMS and common JS libraries for UI and interactivity.
  7. No analytics or tracking scripts detected in the provided HTML.
  8. No security headers detected in the provided data; DNSSEC not enabled.
  9. Domain registration is stable and consistent with business claims.
Technical notes

Notes

The website uses TYPO3 CMS, a mature open-source content management system, combined with Bootstrap and jQuery for responsive design and interactivity. Hosting is provided by Hetzner Online GmbH, a reputable German hosting provider. Performance is moderate with some optimization (e.g., image compression via pagespeed). The site is multilingual with hreflang tags for German, English, and Spanish. No advanced analytics or tracking scripts were detected, indicating a privacy-conscious approach or limited marketing automation. Accessibility is basic but could be improved with ARIA roles and enhanced keyboard navigation support.
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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