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Security report for stadtwerke-flensburg.de

Stadtwerke Flensburg GmbH · Energy · Germany

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

Security score

67/100

Risk levelMedium

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

Stadtwerke Flensburg GmbH is a regional energy and telecommunications provider based in Germany, serving approximately 220,000 electricity customers nationwide and about 60,000 households and businesses regionally with electricity, natural gas, district heating, drinking water, fiber optic internet, and e-mobility solutions. The company emphasizes sustainability and climate neutrality, producing electricity via environmentally friendly combined heat and power plants and expanding fiber optic infrastructure in the region. The website is professionally designed using TYPO3 CMS, featuring comprehensive content and clear navigation tailored to private, commercial, and individual customers. It integrates modern tracking and consent management tools, ensuring moderate user tracking with GDPR compliance mechanisms in place. Security posture is strong with HTTPS and consent management, though explicit privacy and security policies are not found in the provided content. WHOIS data confirms domain legitimacy and consistency with the business identity. Overall, the digital presence reflects a mature, trustworthy utility provider with a focus on sustainability and customer service.

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

6 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. 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';…

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Keep watching stadtwerke-flensburg.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
55
Email security
85
DNS health
60
Network security
100
GDPR outside view
28
Average
67

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 company holds a strong market position as a leading regional utility and telecommunications provider in Flensburg and surrounding areas, offering a broad portfolio of energy and communication services. Its business model combines traditional energy supply with modern digital infrastructure, including fiber optic internet and e-mobility charging. The target audience spans private households, businesses, and housing industry clients. The company leverages partnerships and maintains active social media channels to enhance engagement. Growth indicators include ongoing infrastructure projects and a clear commitment to climate-neutral energy production by 2035. The career portal subdomain indicates investment in workforce development. The company operates in a regulated sector with a focus on sustainability and regional service reliability.

Security posture

The website demonstrates a good security posture with enforced HTTPS, use of consent management for cookies, and asynchronous loading of scripts to optimize performance and security. However, explicit security headers like X-Frame-Options and Content-Security-Policy are not explicitly visible in the provided content and should be verified server-side. No vulnerabilities or exposed sensitive data were detected in the HTML content. The absence of a published security policy or incident response information suggests room for improvement in transparency and readiness. No vulnerability disclosure or security.txt file was found, which is recommended for responsible disclosure. Overall, the site aligns with common best practices but could enhance its security communication and policies.

Recommendations

  1. Publish a clear and accessible privacy policy and terms of service to improve transparency and GDPR compliance.
  2. Implement and verify security headers such as X-Frame-Options, X-Content-Type-Options, and Content-Security-Policy to strengthen browser security.
  3. Create and publish a security policy and incident response page to inform users and stakeholders about security practices and contacts.
  4. Add a vulnerability disclosure policy or security.txt file to facilitate responsible reporting of security issues.
  5. Include contact information for a data protection officer or privacy contact to enhance GDPR compliance and user trust.

Contact details published on the site

Addresses
Legal name
Stadtwerke Flensburg GmbH
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stadtwerke Flensburg GmbH
Description
Bundesweit beziehen rund 220.000 Kunden Strom von den Stadtwerken Flensburg. Seit 2017 gibt es bundesweit auch Erdgasprodukte. In der Region versorgen wir rund 60.000 Haushalte und Unternehmen mit Strom, Fernwärme, Trinkwasser und Telekommunikationsprodukten. Den Strom produzieren wir in umweltschonender Kraft-Wärme-Kopplung an der Flensburger Förde. In den nächsten Jahren werden die Stadtwerke Flensburg, Glücksburg und Harrislee komplett mit schneller Glasfaser erschließen.
Key services
Electricity supply, Natural gas supply, District heating (Fernwärme), Drinking water, Fiber optic internet (Glasfaser), E-mobility charging solutions, Solar energy solutions
Content quality
excellent
Branding
consistent

Technology

Stack
TYPO3 CMS, JavaScript modules, Google Tag Manager, Consentmanager.net, eTracker analytics
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management for cookies
  • No exposed sensitive data in HTML
  • Use of async and defer for scripts

Analytics and tracking

Services
Google Tag Manager, eTracker
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Bing Ads
Tracking pixels
LinkedIn Insight, Bing, eTracker
Marketing tools
Consentmanager.net
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed and well-structured.
  2. Content is comprehensive for energy and telecommunications services.
  3. Consent management for cookies is implemented.
  4. No explicit privacy policy or terms of service found in provided content.
  5. Multiple social media and official links enhance trust.
  6. No security.txt or vulnerability disclosure found.
  7. WHOIS data supports legitimacy and consistency.
  8. No WAF or blocking detected; full content accessible.
Technical notes

Notes

The website is built on TYPO3 CMS, a mature and widely used content management system, indicating a stable and scalable platform. The use of modern JavaScript modules, asynchronous script loading, and integration with Google Tag Manager and eTracker analytics reflects a contemporary technical stack. Consent management is handled via Consentmanager.net, ensuring compliance with cookie regulations. The site is mobile-optimized with responsive images and accessible navigation. Performance is moderate, with compressed CSS and JS assets. Hosting details are not explicit but the domain uses stable name servers under lemarit.de/net, suggesting professional hosting. Technical risks are minimal, but continuous monitoring of third-party scripts and security headers is advised to maintain security and performance.
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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