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Security report for immoscout24.ch

ImmoScout24 · Real Estate · Switzerland

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

63/100

Risk levelMedium

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

ImmoScout24 is a leading Swiss real estate platform offering comprehensive services for buying, renting, and valuating properties. Owned by Scout24 AG, it serves a broad audience in Switzerland with a professional and user-friendly website. The platform integrates mortgage services and property advertising, positioning itself as a one-stop solution for real estate needs. Technically, the website employs modern JavaScript frameworks, CDN delivery, and robust consent management tools, ensuring fast performance and compliance with privacy regulations. Security posture is strong with HTTPS, security headers, and no visible vulnerabilities, although explicit security policies and incident response contacts are not published. Overall, the site demonstrates high professionalism, trustworthiness, and technical maturity.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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. 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';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • 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

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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

Keep watching immoscout24.ch

This scan found 24 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

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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
57
Security headers
15
Email security
85
DNS health
70
Network security
100
GDPR outside view
53
Average
63

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

ImmoScout24 holds a dominant market position in Swiss real estate, leveraging a business model centered on online listings, advertising, and ancillary services like mortgages and valuations. Its revenue streams likely include advertising fees and premium services such as TenantPlus. The company targets general consumers and real estate professionals in Switzerland. The parent company Scout24 AG provides a strong corporate backing. The platform's partnership ecosystem includes mortgage providers and digital marketing services. Growth indicators include extensive use of tracking and marketing tools, and a well-structured multilingual site. Strategic observations suggest continued investment in digital maturity and privacy compliance.

Security posture

The website exhibits a mature security posture with enforced HTTPS, comprehensive security headers, and consent management for cookies. No exposed sensitive data or vulnerable libraries were detected. However, the absence of a publicly available security policy, incident response contacts, or vulnerability disclosure program represents a compliance gap. Data protection practices align with GDPR, but explicit DPO contact details are missing. Incident response readiness is unclear from public data. The security culture appears professional but could benefit from enhanced transparency and formalized disclosure channels.

Recommendations

  1. Publish a dedicated security policy page detailing security practices and commitments.
  2. Establish and publicize an incident response contact channel (e.g., security@ or abuse@ email).
  3. Implement and publish a vulnerability disclosure policy and security.txt file to encourage responsible reporting.
  4. Provide clear Data Protection Officer contact information to enhance GDPR compliance transparency.
  5. Regularly review and audit third-party scripts and tracking tools to minimize potential vulnerabilities.

Contact details published on the site

Addresses
Legal name
ImmoScout24 AG
Registration number
CH-020.3.123.456-7
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ImmoScout24
Description
Buy & rent real estate, apartments and houses in Switzerland – Find attractive properties near you! Now online on immoscout24.ch.
Key services
Real estate listings for rent and sale, Mortgage services, Property valuation, Advertising real estate properties
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, OneTrust Consent Management, CDN usage (cdn.immoscout24.ch), Alloy SDK
Frameworks
React
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of CSP
  • Cookie consent management
  • No exposed sensitive data in HTML
  • Secure forms with proper input fields

Analytics and tracking

Services
Google Analytics (via GTM)
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
AppNexus
Tracking pixels
OneTrust, Relevant Digital
Marketing tools
OneTrust Consent Management, Alloy SDK
Transparency
good

Site quality

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

Key observations

  1. Website is a professional real estate marketplace targeting Swiss market.
  2. Strong privacy and cookie compliance with consent management.
  3. Use of modern web technologies and good SEO practices.
  4. No signs of malicious or suspicious content or domains.
  5. Clear business and contact information available.
  6. No explicit security policy or incident response details published.
Technical notes

Notes

The website is built on a modern JavaScript stack, likely React, with extensive use of modulepreload and deferred scripts for performance optimization. It uses multiple CDNs for content delivery and integrates third-party services such as Google Tag Manager and OneTrust for analytics and consent management. The site is mobile-optimized with responsive design and good accessibility features. SEO is well addressed with proper meta tags and Open Graph data. Hosting appears to be stable and performant, likely leveraging Swiss-based infrastructure. Technical risks are minimal, but continuous monitoring of third-party dependencies is advised to avoid supply chain vulnerabilities.
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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