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Security report for prepaid-karte-vergleich.de

Jonas Becker · Telecommunications · Germany

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

Security score

44/100

Risk levelHigh

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

The website prepaid-karte-vergleich.de is an independent German platform specializing in the comparison of prepaid mobile tariffs and monthly cancellable mobile plans. It offers users a comprehensive, ad-free, and user-friendly interface to compare tariffs across major German mobile networks (D1, D2, o2, EPlus). The business is operated by Jonas Becker, who has been active since 2011, providing trustworthy and manually verified tariff information. The site targets German consumers seeking cost-effective and flexible prepaid mobile solutions. Technically, the site uses a modern but somewhat dated technology stack including jQuery 2.1.4, Bootstrap, noUiSlider, and DataTables, hosted on infrastructure associated with GoDaddy. The site is mobile-optimized and provides good SEO and accessibility basics. Security-wise, the site enforces HTTPS, includes CSRF tokens, and implements a GDPR-compliant cookie consent mechanism, though it lacks explicit security headers and incident response disclosures. Overall, the site demonstrates a solid security posture with room for improvement in security headers and formal policies. The domain WHOIS data is consistent with the business claims, showing no privacy protection and legitimate registration. No WAF or blocking mechanisms interfere with content access. The site is safe for general audiences with no adult or questionable content. Contact information is clearly provided, including a company email and physical address in Germany. The site does not display terms of service or explicit security policies, which could be enhanced for better compliance and trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
48/ 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

  2. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • Critical

      Critical Service Exposed: MySQL

      Port 3306 (MySQL) is publicly accessible - MySQL - Database server

      What to do: Immediately restrict access to MySQL using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

  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 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';…

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

Keep watching prepaid-karte-vergleich.de

This scan found 28 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

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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

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
72
Security headers
15
Email security
70
DNS health
60
Network security
0
GDPR outside view
48
Average
44

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 · found on this site
  • 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

Prepaid-karte-vergleich.de occupies a niche in the German telecommunications market as an independent prepaid tariff comparison platform. Its competitive advantage lies in its ad-free, transparent, and manually curated tariff listings, appealing to cost-conscious consumers seeking flexibility. The business model likely relies on affiliate commissions from directing users to mobile tariff providers. The target customer segment includes individuals looking for prepaid SIM cards, internet options, and flexible mobile plans without long-term contracts. The site shows growth potential by expanding tariff options and maintaining trust through clear contact and privacy policies. Partnerships with major mobile providers are implied through tariff listings but no explicit partner domains are identified. The platform's operational maturity is moderate, with a focus on user experience and compliance with GDPR. Strategic observations include the need to formalize security and incident response policies and to enhance technical security controls to maintain competitive trustworthiness.

Security posture

The website demonstrates a good security maturity level with mandatory HTTPS encryption and a GDPR-compliant cookie consent mechanism. The presence of a CSRF token meta tag indicates awareness of common web security threats. However, the absence of explicit HTTP security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), X-Frame-Options, and X-XSS-Protection reduces the overall security posture. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The site lacks published incident response or security policies, which limits transparency and preparedness in case of security events. Compliance with GDPR is evident through privacy and cookie policies, but further enhancements in security documentation and technical controls are recommended. Overall, the security posture is solid but could be improved by implementing additional headers, updating libraries, and publishing formal security policies.

Recommendations

  1. Implement HTTP security headers including CSP, HSTS, X-Frame-Options, and X-XSS-Protection to enhance protection against common web attacks.
  2. Publish a formal security policy and incident response plan accessible to users to improve transparency and preparedness.
  3. Regularly update JavaScript libraries such as jQuery to the latest stable versions to mitigate known vulnerabilities.
  4. Enhance accessibility features to improve compliance with standards and user experience for all users.
  5. Consider adding explicit terms of service and vulnerability disclosure policies to strengthen legal and security posture.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Jonas Becker
Description
Unabhängiger und werbefreier Vergleich von Prepaid Tarifen und monatlich kündbaren Handytarifen in Deutschland, inklusive Telefonie, SMS, Internet Flat und weiteren Optionen.
Key services
Prepaid tariff comparison, Information and guides on prepaid tariffs, Filtering and detailed tariff data, Affiliate links to offers
Content quality
good
Branding
consistent

Technology

Stack
jQuery 2.1.4, Bootstrap, noUiSlider, wNumb, DataTables, Font Awesome, Google Fonts (Open Sans)
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • CSRF token meta tag present
  • Cookie consent implemented

Analytics and tracking

Tracking level
minimal
Privacy practices
excellent

Advertising

Transparency
excellent

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 challenge.
  2. Content is in German and targeted at German prepaid mobile users.
  3. Comprehensive tariff comparison with filtering and detailed info.
  4. Clear privacy and cookie policies with consent mechanism.
  5. No explicit terms of service found.
  6. Contact info includes email and physical address in Germany.
  7. No explicit security or incident response policies published.
  8. No visible analytics or tracking scripts detected beyond cookie consent.
  9. No advertising or affiliate disclosures visible in main content.
  10. Technical stack is modern but uses older jQuery version.
Technical notes

Notes

The website uses a custom or unknown CMS with a technology stack comprising jQuery 2.1.4, Bootstrap, noUiSlider, wNumb, DataTables, Font Awesome, and Google Fonts. The site is hosted with domaincontrol.com (GoDaddy) nameservers, indicating a commercial hosting environment. Performance is moderate with good mobile optimization and basic accessibility. SEO is well addressed with proper meta tags and structured navigation. The site uses AJAX for dynamic content loading and has implemented a cookie consent mechanism from freeprivacypolicy.com. No major technical debt or deprecated technologies were detected, but the jQuery version is outdated and should be upgraded. The site lacks explicit security headers which is a technical risk. Overall, the infrastructure is stable and suitable for the business purpose but can benefit from modernization and enhanced security controls.
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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