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Security report for er.cz

Tomáš Martínek · Technology · Czech Republic

Medium risk. 9 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

56/100

Risk levelMedium

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

ER.cz is a small Czech-based service providing free third-level domain redirection under the er.cz domain. The service targets Czech internet users who want to simplify or mask their website URLs by offering free domain aliases, email aliases, and visitor statistics. The business appears to be operated by Tomáš Martínek since at least 2004, positioning itself as a niche provider in the Czech internet domain redirection market. The website content is primarily in Czech and offers basic navigation and support features including a discussion forum and FAQ. Technically, the site uses standard HTML, CSS, and JavaScript with Matomo analytics for visitor tracking, but lacks modern security features such as HTTPS enforcement and security headers. The absence of WHOIS data is typical for .cz domains but limits independent verification of domain ownership and age. Contact information is limited to an email address and a contact page, with no phone numbers or social media presence. Overall, the site serves a specialized function with modest technical sophistication and limited security and privacy compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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

9 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 Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

  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';…

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

Keep watching er.cz

This scan found 26 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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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
52
Security headers
15
Email security
70
DNS health
75
Network security
100
GDPR outside view
25
Average
56

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 business operates in the technology sector, specifically in domain redirection and internet services. Its competitive advantage lies in offering free domain redirection with additional features like email aliases and statistics, which are uncommon to be provided free of charge. The business model relies on free service offerings possibly monetized through advertising partnerships, as evidenced by ad placements from wedosas.net and toplist.cz. The target customers are Czech internet users needing simple domain redirection solutions. The company maintains partnerships with Czech internet marketing and catalog sites, enhancing its ecosystem. Growth indicators are limited but the long operational history since 2004 suggests stable niche presence. The lack of modern web design and security features may limit broader market appeal.

Security posture

The security posture of ER.cz is basic and requires significant improvement. The website does not enforce HTTPS, lacks security headers, and does not publish privacy or cookie policies, which are critical for GDPR compliance and user trust. The login form uses POST but lacks visible advanced protections such as CSRF tokens or multi-factor authentication. No incident response or vulnerability disclosure policies are published. While no explicit vulnerabilities or malware were detected in the HTML content, the absence of modern security best practices exposes the site to potential risks. The use of Matomo analytics with disabled cookies is a positive privacy consideration but insufficient to offset other security gaps. Overall, the site scores low on security maturity and should prioritize implementing HTTPS, security headers, and privacy compliance measures.

Recommendations

  1. Implement HTTPS with a valid SSL/TLS certificate and enforce secure connections site-wide.
  2. Add standard security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Publish comprehensive privacy and cookie policies to comply with GDPR and inform users.
  4. Enhance login form security with CSRF protection, input validation, and consider multi-factor authentication.
  5. Establish and publish incident response and vulnerability disclosure policies to improve security transparency and readiness.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Tomáš Martínek
Description
Nejkvalitnější přesměrování pro Váš web, které můžete získat zdarma! Kromě samotného přesměrování 3. řádu (dvoupísmené domény er.cz), vám nabízíme také e-mailový alias, statistiky, velké možnosti nastavení, rozsáhlou nápovědu, soutěže a další věci, které Vám zdarma nikdo jiný nenabídne!
Key services
free third-level domain redirection (*.er.cz), email alias, statistics, customizable settings, help and support, discussion forum
Content quality
basic
Branding
moderate

Technology

Stack
HTML, CSS, JavaScript, Matomo analytics
Performance
moderate
Mobile
poor
Accessibility
basic
SEO
basic

Security

Observed score
40/100
Good practices seen
  • No exposed sensitive data in HTML
  • Login form uses POST method

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
poor

Advertising

Ad networks
wedosas.net
Tracking pixels
toplist.cz
Marketing tools
Matomo analytics
Transparency
basic

Site quality

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

Key observations

  1. Website provides free third-level domain redirection service for Czech users.
  2. Content is primarily in Czech language with some English keywords.
  3. No HTTPS enforcement visible in HTML content; security posture is weak.
  4. No privacy, cookie, or terms of service policies found on site.
  5. Contact email info@er.cz is provided in meta tags and contact page.
  6. Site uses Matomo analytics with cookies disabled.
  7. Advertising is present via wedosas.net ad network and toplist.cz tracking pixel.
  8. Site design is dated and not mobile optimized.
  9. WHOIS data is unavailable from CZ NIC WHOIS server, typical for .cz domains with privacy.
  10. No social media links or phone numbers found.
Technical notes

Notes

The website is built using traditional HTML, CSS, and JavaScript without modern frameworks or CMS platforms. It uses Matomo analytics for visitor tracking with cookies disabled, indicating some privacy awareness. The site performance is moderate but lacks mobile optimization and accessibility features. The design is dated and navigation is basic but functional. Advertising is integrated via wedosas.net and toplist.cz tracking pixels. No hosting provider or CMS is identified from the content. The site would benefit from modernization including responsive design, accessibility improvements, and SEO enhancements. Technical debt is evident in the lack of HTTPS and security headers, which pose operational risks. Overall, the technical infrastructure supports the niche service but requires updates to meet current web standards and security expectations.
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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