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Security report for kostal-solar-electric.com

KOSTAL Solar Electric GmbH · Energy · Germany

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

75/100

Risk levelMedium

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

KOSTAL Solar Electric GmbH is a medium-sized German company specializing in the manufacture and sale of photovoltaic inverters, battery storage solutions, and wallbox charging stations. The company positions itself as a leading innovator in the solar energy sector with a strong emphasis on German engineering quality and sustainability. Their product portfolio targets private homeowners, commercial enterprises, and professional installers, offering integrated energy management systems and smart charging solutions. The website reflects a mature digital presence built on TYPO3 CMS with modern front-end technologies and a comprehensive multi-language structure. Security posture is solid with HTTPS and consent management in place, though some improvements in security headers and incident response transparency are recommended. The absence of WHOIS registration data for the domain is a notable inconsistency that slightly impacts trustworthiness from a domain registration perspective. Overall, the site is professional, content-rich, and well-structured, supporting KOSTAL's market position as a reputable energy technology provider.

Scanned

NIS2 and GDPR posture

GDPR outside view
65/ 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

5 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 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

  3. 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
    • High

      SSL Certificate Expires Soon

      SSL certificate expires in 10 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates

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

Keep watching kostal-solar-electric.com

This scan found 19 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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Full report

€39.90one-time

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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
62
Security headers
80
Email security
70
DNS health
70
Network security
100
GDPR outside view
65
Average
75

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

KOSTAL Solar Electric operates within the energy and transportation sectors, leveraging its parent company KOSTAL Gruppe's extensive industrial footprint. The company benefits from multiple design and innovation awards, reinforcing its competitive advantage in quality and product innovation. Its business model focuses on manufacturing and selling high-quality solar inverters and related products, supported by installer portals and customer service. The website's multi-language support and detailed product information indicate a strategy targeting European markets. Partnerships and sister companies within the KOSTAL group expand its ecosystem, enhancing market reach and technological synergies. The company’s emphasis on sustainability and smart energy solutions aligns with current market trends and regulatory frameworks, positioning it well for growth.

Security posture

The website demonstrates a good security posture with enforced HTTPS and integration of a GDPR-compliant consent management platform (Usercentrics). No sensitive data is exposed in the HTML content, and no vulnerable libraries were detected. However, the absence of explicit HTTP security headers such as Content Security Policy, HSTS, and X-Frame-Options suggests room for improvement. There is no visible security.txt or vulnerability disclosure policy, and no dedicated incident response contact information is provided, which could hinder timely reporting and handling of security incidents. Overall, the security maturity is moderate to good, suitable for a commercial website but with potential enhancements to align with best practices.

Recommendations

  1. Implement comprehensive HTTP security headers including CSP, HSTS, X-Frame-Options, and X-Content-Type-Options to enhance protection against common web attacks.
  2. Publish a security.txt file to facilitate responsible vulnerability disclosure and improve transparency.
  3. Provide explicit incident response contact information on the website to support security communication and compliance.
  4. Regularly audit and update third-party libraries and scripts to mitigate potential vulnerabilities.
  5. Enhance data retention and privacy policy transparency to strengthen GDPR compliance and user trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
KOSTAL Solar Electric GmbH
Description
KOSTAL is a leading German manufacturer of innovative solar, hybrid, and battery inverters for private and commercial photovoltaic systems, offering efficient and sustainable energy solutions made in Germany.
Key services
Solar and hybrid inverters, Battery storage solutions, Wallbox charging stations, Energy management systems, Installer support and portals
Content quality
excellent
Branding
consistent

Technology

Stack
TYPO3 CMS, Bootstrap (implied by classes), Swiper.js (carousel), Usercentrics CMP, Google Tag Manager
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of consent management platform for GDPR compliance
  • No exposed sensitive data in HTML
  • No visible vulnerable libraries

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Marketing tools
Usercentrics Consent Management Platform
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 and navigation
  2. Content is in German with multi-language support
  3. Strong branding and consistent corporate identity
  4. Use of modern CMS TYPO3 and integration of consent management
  5. No visible security or privacy red flags in content
  6. WHOIS data missing or domain unregistered, which is unusual for a professional business site
Technical notes

Notes

The website is built on TYPO3 CMS, a robust and widely used open-source content management system, indicating a stable and scalable infrastructure. Front-end technologies include Bootstrap-like responsive design and Swiper.js for interactive sliders, ensuring good mobile optimization and user experience. The integration of Usercentrics for consent management and Google Tag Manager for analytics reflects a modern approach to privacy and data tracking. Performance appears moderate, with compressed CSS and JS assets, though no explicit hosting provider information was found. Accessibility features such as skip links and semantic HTML elements are present, supporting usability. Overall, the technical stack is mature and well-implemented, with opportunities to improve security headers and incident response mechanisms.
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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