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Security report for immobilienscout24.de

ImmoScout24 · Real Estate · Germany

Medium risk. 7 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

62/100

Risk levelMedium

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

ImmoScout24 is Germany's leading online real estate marketplace, offering a comprehensive platform for property seekers and owners to buy, rent, and sell residential and commercial real estate. The platform serves both private individuals and professional real estate agents, providing extensive listings and additional services such as mortgage financing and agent search. The website demonstrates a mature digital infrastructure leveraging modern web technologies like React and Next.js, hosted on AWS, ensuring fast performance and mobile optimization. Security posture is strong with HTTPS enforcement and security headers, although explicit security policies and incident response contacts are not publicly detailed. Privacy compliance is robust with clear GDPR-aligned policies and cookie consent mechanisms. Overall, ImmoScout24 presents a trustworthy, professional, and well-maintained online presence with high business credibility and technical maturity.

Scanned

NIS2 and GDPR posture

GDPR outside view
28/ 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

7 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 Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

  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 immobilienscout24.de

This scan found 25 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
77
Security headers
15
Email security
82
DNS health
70
Network security
100
GDPR outside view
28
Average
62

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention immobilienscout24.de, from OffSeq Breach.

Total records
19,257
Employees
2
Customers
19,196
Third parties
59
Weak passwords
18%

Latest record dated 2025-07-20 · 24 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for immobilienscout24.de.

Select it in the checkout above.

Masked preview

  • –socialday.immobilienscout24.de2025-07-20
  • –sso.immobilienscout24.de2025-07-20

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

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 the German real estate sector, backed by its parent company Scout24 AG. The business model revolves around connecting property buyers, renters, and sellers through an online platform, monetizing via property listings and value-added services. The company targets a broad audience including private consumers and real estate professionals. Its ecosystem includes partnerships with mortgage providers and real estate agents, enhancing service offerings. The platform's longevity and consistent branding reinforce its competitive advantage. Growth indicators include extensive user engagement and integration of advanced digital tools such as chatbots and single sign-on services.

Security posture

The website exhibits a mature security posture with enforced HTTPS, comprehensive security headers, and secure login mechanisms. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. However, the absence of a dedicated security policy page and explicit incident response contact details suggests room for improvement in transparency and readiness. GDPR compliance is evident, but further enhancements such as publishing a security.txt file and detailed data retention policies would strengthen the security culture and incident management capabilities.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement and publicize a security.txt file to facilitate vulnerability disclosures.
  3. Regularly audit and update third-party scripts to mitigate potential vulnerabilities.
  4. Enhance data retention policy disclosures to align with GDPR best practices.
  5. Continue investing in user privacy and security awareness to maintain trust.

Contact details published on the site

Addresses
Legal name
ImmoScout24 GmbH
VAT number
DE 811 273 019
Registration number
HRB 123456 B
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ImmoScout24
Description
Anbieten. Suchen. Finden. Die größte Auswahl an Wohnungen, Häusern und Gewerbeflächen findest du nur bei ImmoScout24. Immobilien ab 0€ vermieten ✓ Jetzt Traumwohnung finden ✓ ImmobilienScout24
Key services
Real estate search (rent and buy), Property listing and advertising, Real estate agent finder, Mortgage and financing services
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, AWS DNS (Amazon Route 53), Google Identity Services, Various JavaScript libraries
Frameworks
Next.js
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No exposed sensitive data in HTML
  • Secure login mechanisms

Analytics and tracking

Services
Tealium
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Tealium (utag.js), ImmoScout24 tracking scripts
Marketing tools
Google Identity Services, Chatbot widget
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is in German and targeted at German real estate market.
  3. Strong branding and professional design consistent with a market leader.
  4. Use of modern web technologies and frameworks.
  5. Privacy and cookie policies are present and GDPR compliant.
  6. No explicit security policy or incident response contact found publicly.
  7. No suspicious or malicious domains detected.
  8. Multiple tracking and marketing scripts used but with consent mechanisms.
  9. No adult or NSFW content detected.
Technical notes

Notes

The website is built on a modern tech stack including React and Next.js, ensuring server-side rendering and fast client-side interactions. Hosting on AWS provides scalability and reliability. The site is well-optimized for mobile devices and accessibility, with proper meta tags and SEO considerations. Use of Google Identity Services and chatbot integrations indicate advanced user engagement strategies. Performance is fast with efficient resource loading and caching. Technical risks are minimal, but ongoing monitoring of third-party dependencies is advised to prevent 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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