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Security report for vivantus-verhuur.nl

Vivantus Verhuur · Real Estate · Netherlands

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

Security score

55/100

Risk levelMedium

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

Vivantus Verhuur is a leading real estate rental management company in the Netherlands, operating as part of the larger Vivantus Groep. The company specializes in rental management services for both small and large investors, focusing on minimizing vacancy and payment risks while maximizing rental returns. With 37 offices and multiple local brands, Vivantus Verhuur holds a strong market position in the Dutch real estate rental sector. The website reflects a professional and consistent brand image, targeting landlords and real estate investors. Technically, the site uses modern web technologies including Umbraco CMS, Google Tag Manager, and Leaflet.js for maps, with good mobile optimization and moderate performance. Security posture is adequate with HTTPS enabled but lacks some security headers and explicit security policies. Privacy compliance is basic with a cookie consent mechanism but no visible privacy or terms of service pages. Overall, the site is trustworthy and well-maintained, with clear contact information and partner affiliations.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 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 vivantus-verhuur.nl

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.

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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
15
Email security
70
DNS health
60
Network security
100
GDPR outside view
10
Average
55

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 operates a centralized rental management model leveraging regional expertise through multiple local brands. Its revenue streams likely include rental management fees, tenant placement services, and advisory on rental pricing. The target customers are real estate investors and landlords seeking professional rental management solutions. The partnership ecosystem includes well-known local real estate agencies, enhancing market reach and credibility. Growth indicators include a large number of offices and employees, and active LinkedIn presence. The website's content and structure support lead generation and client engagement, though privacy and security policies could be enhanced to meet evolving compliance standards.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and no visible sensitive data exposure. However, it lacks important security headers such as Content-Security-Policy and X-Frame-Options, which could mitigate common web attacks. There is no visible incident response or vulnerability disclosure policy, which limits transparency in security management. The absence of a security.txt file and security contact channels suggests limited readiness for coordinated vulnerability reporting. No vulnerable or outdated libraries were detected in the scripts. Overall, while the site is not at high risk, improvements in security headers and policy transparency are recommended to strengthen defenses and compliance.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  2. Publish a clear privacy policy and terms of service on the main domain to improve GDPR compliance and user trust.
  3. Add a vulnerability disclosure policy or security.txt file to facilitate responsible security reporting.
  4. Enhance accessibility features and SEO metadata to improve user experience and search engine ranking.
  5. Regularly audit third-party scripts and dependencies to ensure no vulnerabilities are introduced.

Contact details published on the site

Addresses
Legal name
Vivantus Verhuur
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Vivantus Verhuur
Description
Vivantus Verhuur ontzorgt kleine en grote beleggers met alle vraagstukken rondom verhuur, zowel bij wederverhuur als bij nieuwbouwprojecten. Het team van landelijke en regionale experts helpt klanten de juiste keuzes te maken, zodat het risico op leegstand en wanbetaling laag blijft en het rendement zo hoog mogelijk is.
Key services
Rental management, Wederverhuur (re-rental) management, Huurprijsadvies (rental price advice), Marketing and tenant selection, Verhuurmanagement uit handen nemen (full rental management)
Content quality
good
Branding
consistent

Technology

Stack
Google Tag Manager, FontAwesome, Leaflet.js, Swiper.js, Umbraco CMS, Polyfill for promises, ASP.NET client validation
Frameworks
Umbraco CMS
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • No visible exposed sensitive data
  • No vulnerable libraries detected in scripts
  • Use of Google Tag Manager for analytics

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
basic

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and well-structured.
  2. Content is focused on real estate rental management services.
  3. Multiple trusted partner and subsidiary brands are linked.
  4. Contact information is clearly provided with physical address, phone, and email.
  5. Cookie consent mechanism is implemented.
  6. No explicit privacy policy or terms of service found on the main domain.
  7. Use of modern web technologies and CMS (Umbraco).
  8. No security headers detected; opportunity for security improvements.
  9. No visible forms collecting personal data on the homepage.
  10. No suspicious or malicious content detected.
Technical notes

Notes

The website is built on the Umbraco CMS platform, utilizing modern JavaScript libraries such as Leaflet.js for interactive maps and Swiper.js for sliders. Google Tag Manager is used for analytics and marketing tags. The site is mobile responsive with good design quality and navigation clarity. Performance is moderate, with deferred script loading and optimized images. However, the site lacks some advanced SEO and accessibility features. Hosting provider details are not explicitly identified. The technical stack is modern and maintainable but could benefit from enhanced security configurations and performance optimizations.
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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