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Security report for csl.de

CSL Computer Service Langenbach GmbH · Technology · Germany

Medium risk. 7 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

54/100

Risk levelMedium

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

CSL Computer Service Langenbach GmbH is a well-established German technology company specializing in internet services including managed hosting, root servers, private cloud solutions, colocation, domain registration, SSL certificates, and connectivity. Founded in 1972 and active in the internet service market since 1995, CSL operates its own data center in Düsseldorf and holds ICANN accreditation for domain registration. The company targets business clients seeking reliable and customizable hosting and connectivity solutions, positioning itself as a trusted regional provider with long-term customer relationships and a pragmatic service approach. Technically, the website employs a modern but standard technology stack including jQuery, Bootstrap, Font Awesome, and various plugins for UI and analytics (Piwik/Matomo). The site is mobile-optimized with good navigation and SEO practices. Hosting appears to be managed internally, reflecting the company’s own data center capabilities. Performance is moderate with no critical technical issues detected. From a security perspective, the site uses HTTPS with a good SSL configuration and implements cookie consent mechanisms compliant with GDPR. However, no explicit security policy or incident response information is published, and security headers are not detected. No vulnerabilities or exposed sensitive data were found. The WHOIS data is consistent with the company’s identity and history, supporting legitimacy. Overall, CSL presents a professional and trustworthy online presence with solid business credibility and moderate technical maturity. Strategic improvements in security transparency and formal policies would enhance their security posture and compliance standing.

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

7 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. 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';…

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Keep watching csl.de

This scan found 31 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.

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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
62
Security headers
15
Email security
55
DNS health
65
Network security
100
GDPR outside view
28
Average
54

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 csl.de, from OffSeq Breach.

Total records
8
Employees
0
Customers
8
Third parties
0
Weak passwords
0%

2 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for csl.de.

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Breach keeps ingesting new leaks, so these numbers can grow between scans.

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Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

CSL holds a strong market position as a regional internet service provider with a broad portfolio of hosting and connectivity services. Their ICANN accreditation and operation of Joker.com domain platform indicate a competitive advantage in domain management. The company’s business model focuses on service-oriented, customizable solutions for business clients, supported by a qualified team and own data center infrastructure. Long-term customer testimonials and partnerships with recognized companies reflect stable revenue streams and growth potential. The partnership ecosystem includes connectivity and infrastructure providers, enhancing service reliability. CSL’s operations emphasize pragmatic customer service and technical expertise, positioning them well in the German technology and telecommunications sectors.

Security posture

CSL demonstrates a moderate security maturity level with HTTPS enforced and GDPR-compliant cookie consent. The absence of a published security policy, incident response contacts, and security.txt file indicates gaps in formal security governance and transparency. No critical vulnerabilities or exposed sensitive data were detected, and the use of privacy-respecting analytics (Piwik/Matomo) is a positive indicator. The lack of security headers reduces defense-in-depth. Overall, CSL’s security posture is adequate for their business scale but would benefit from enhanced documentation, formal policies, and additional technical controls to improve resilience and compliance.

Recommendations

  1. Publish a formal security policy and incident response plan accessible on the website.
  2. Implement and configure security headers such as Content-Security-Policy, X-Frame-Options, and HTTP Strict Transport Security (HSTS).
  3. Consider publishing a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  4. Regularly audit and update third-party scripts and plugins to mitigate potential vulnerabilities.
  5. Enhance transparency around data protection and retention policies to strengthen GDPR compliance.

Contact details published on the site

Addresses
Legal name
CSL Computer Service Langenbach GmbH
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
CSL Computer Service Langenbach GmbH
Description
Ihr Internet Service Provider und Applikations-Hoster seit 1995. Individuelle Lösungen und deren Implementierung und Betreuung sind unsere Spezialität. ICANN akkreditierter Domainregistrar seit 2001 - mit Domains kennen wir uns aus.
Key services
Managed Hosting, Root Server, Private Cloud, Inhousing – Colocation, Domains, SSL Zertifikate, Connectivity
Content quality
good
Branding
consistent

Technology

Stack
jQuery, Bootstrap, Font Awesome, Owl Carousel, Revolution Slider, Fancybox, Google Fonts (commented out), Piwik/Matomo Analytics
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enabled
  • Cookie consent banner implemented
  • No exposed sensitive data found
  • No vulnerable libraries detected

Analytics and tracking

Services
Piwik/Matomo
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Piwik/Matomo
Marketing tools
Piwik/Matomo Analytics
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 some English elements.
  3. No forms detected on the homepage; contact is via email links.
  4. Multiple customer testimonials and partner logos enhance trust.
  5. Cookie consent banner is implemented and GDPR compliant.
  6. No explicit security policy or incident response info published.
  7. Use of Piwik/Matomo analytics indicates privacy-conscious tracking.
  8. No social media links detected in the provided content.
  9. WHOIS data is transparent and consistent with business claims.
Technical notes

Notes

The website uses a conventional but effective technology stack with jQuery, Bootstrap, and several UI plugins to deliver a responsive and user-friendly experience. Hosting is likely managed internally, leveraging their own data center infrastructure, which supports control over performance and security. The site is mobile-optimized and SEO-friendly, though accessibility features are basic. Performance is moderate, with no major technical debt or deprecated technologies detected. Opportunities exist to modernize by adopting newer frameworks or enhancing accessibility compliance. Technical risks are low but could be further mitigated by improving security headers and formalizing technical policies.
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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