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Security report for rengl.cz

RENGL, s.r.o. · Retail · Czech Republic

High risk. 9 critical or high findings in GDPR outside view, Security headers and 2 other checks.

Security score

45/100

Risk levelHigh

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

RENGL, s.r.o. operates a large network of poster advertising sites across Czech Republic, Slovakia, and Poland, offering poster posting and printing services. The company targets businesses and organizations seeking outdoor advertising solutions, positioning itself as a leading regional provider with a network of 5,000 poster sites in 170 cities. The website is professionally designed, mobile optimized, and provides clear service descriptions and contact information. Technically, the site uses modern JavaScript libraries for UI enhancements but lacks some advanced security headers and cookie consent mechanisms. The WHOIS data is missing, which reduces domain trust, but the website content and contact details appear legitimate and consistent with the business claims. Overall, the site scores well on content quality and business credibility but could improve privacy compliance and security posture.

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 rengl.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.

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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
70
DNS health
75
Network security
20
GDPR outside view
25
Average
45

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

RENGL holds a strong market position in outdoor advertising within Central Europe, leveraging a proprietary network of poster sites. Their business model focuses on service provision including poster posting, printing, and adhesive sales. The company targets advertisers and event organizers, offering flexible campaign durations and geographic coverage. The website indicates a medium-sized enterprise with consistent branding and trust signals such as GDPR compliance and detailed contact info. Partnerships with regional domains (rengl.sk and rengl.pl) suggest a multi-country operational footprint. No direct revenue streams or financial data are disclosed, but the service-oriented model implies B2B revenue generation. Growth indicators include recent news about new poster sites and collection points.

Security posture

The website employs HTTPS and secure form submission but lacks visible security headers such as Content Security Policy or HSTS. No known vulnerabilities or exposed sensitive data were detected in the HTML. The absence of a cookie consent mechanism and security policy page indicates partial GDPR compliance. No incident response or vulnerability disclosure information is provided. The use of multiple third-party JavaScript libraries necessitates regular updates to mitigate potential vulnerabilities. Overall, the security posture is moderate with room for improvement in headers, privacy notices, and incident readiness.

Recommendations

  1. Implement comprehensive security headers including CSP, HSTS, and X-Frame-Options to enhance protection against common web attacks.
  2. Add a cookie consent banner and detailed cookie policy to improve GDPR compliance and user transparency.
  3. Publish a security policy and incident response contact information to build trust and preparedness.
  4. Regularly audit and update third-party libraries to reduce risk of vulnerabilities.
  5. Enhance accessibility features to improve usability for all users and meet compliance standards.

Contact details published on the site

Addresses
Legal name
RENGL, s.r.o.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
RENGL, s.r.o.
Description
RENGL provides poster posting services with a network of 5,000 poster sites across Czech Republic, Slovakia, and Poland. They also offer poster printing and related services.
Key services
Poster posting campaigns, Poster printing, Adhesive sales
Content quality
good
Branding
consistent

Technology

Stack
jQuery 3.6.0, Lightbox, Slick Carousel, Slimbox2, Uploadify, DataTables, Galleria
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • Use of HTTPS (assumed from URL)
  • No exposed sensitive data in HTML
  • Form uses POST method with validation

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is fully accessible with rich content in Czech language.
  2. No WHOIS data available, which is unusual and reduces domain trust.
  3. No explicit privacy or cookie consent banner found despite GDPR page.
  4. Contact information is clearly presented with company address, phone, and email.
  5. No social media links detected.
  6. No security headers detected in HTML source; security posture can be improved.
  7. No analytics or tracking scripts detected in provided HTML.
  8. Website uses multiple JavaScript libraries for UI and galleries.
  9. No signs of adult or questionable content.
  10. Website is mobile optimized with responsive sliders and menus.
Technical notes

Notes

The website uses a variety of JavaScript libraries such as jQuery 3.6.0, Lightbox, Slick Carousel, Slimbox2, Uploadify, DataTables, and Galleria for enhanced UI and media presentation. The site is mobile responsive with sliders optimized for different device types. The HTML structure is valid and SEO-friendly with appropriate meta tags and keywords. However, no CMS or hosting provider information is evident. Performance is moderate, with potential improvements in loading speed and accessibility. The lack of visible analytics or tracking scripts suggests minimal user tracking, which aligns with privacy considerations but limits marketing insights.
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

Earlier scans of this domain

  1. 45/100High35 findingsView report
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