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Security report for deinzimmer.de

Real Estate · Germany

Medium risk. 3 critical or high findings in Security headers and GDPR outside view.

Security score

75/100

Risk levelMedium

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

DeinZimmer.de is an online platform specializing in affordable temporary accommodations in Germany, targeting students and individuals seeking short-term housing solutions such as student rooms, shared apartments, and apartments. The platform offers over 5,000 listings with a focus on ease of search, free mediation, and direct contact between renters and landlords. Technically, the website leverages modern JavaScript, Google Maps API for location services, and Google Tag Manager for analytics, hosted on Amazon AWS infrastructure. The site is well-structured, mobile-optimized, and provides a good user experience with clear navigation and relevant content. Security-wise, the site uses HTTPS and avoids exposing sensitive data, but lacks visible security headers and explicit privacy or cookie policies, which are important for GDPR compliance. Overall, the website is legitimate and professional but would benefit from enhanced privacy compliance and security best practices.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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

3 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 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 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 deinzimmer.de

This scan found 19 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
100
Security headers
30
Email security
82
DNS health
70
Network security
100
GDPR outside view
68
Average
75

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 platform operates in the real estate sector focusing on temporary housing, primarily serving students and transient renters in Germany. It maintains a medium-sized presence with a substantial listing base, indicating a solid market position. The business model revolves around providing a free mediation service and direct contact facilitation, likely monetized through advertising or premium listings. The absence of detailed company information and contact data limits deeper business intelligence, but the use of AWS and Google services suggests a mature digital infrastructure. No partnerships or subsidiaries were identified from the data. The platform's focus on affordability and ease of use positions it competitively in the student housing niche.

Security posture

The website demonstrates a basic to moderate security posture with HTTPS enabled and no immediate signs of vulnerabilities or exposed sensitive information. However, the lack of security headers such as Content-Security-Policy, X-Frame-Options, and others reduces its defense-in-depth. The absence of explicit security policies or incident response contacts indicates room for improvement in security governance and transparency. The use of third-party scripts like Google Tag Manager requires ongoing monitoring to mitigate supply chain risks. No WAF or blocking mechanisms were detected, and the site is fully accessible. Enhancing security headers and publishing clear security and privacy policies would strengthen the overall security posture.

Recommendations

  1. Publish comprehensive privacy and cookie policies with clear GDPR compliance statements.
  2. Implement standard security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Provide explicit contact information including emails and phone numbers for general and security-related inquiries.
  4. Regularly audit third-party scripts and dependencies for vulnerabilities.
  5. Enhance accessibility features to improve inclusivity and compliance with standards.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
Über 5.000 günstige Unterkünfte für die Zwischenzeit: Studentenzimmer, WGs, Apartments. Schnelle & einfache Suche, kostenfreie Vermittlung, direkter Kontakt.
Key services
Accommodation listings, Free mediation, Direct contact between renters and landlords
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Google Maps API, Google Tag Manager
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • No visible sensitive data exposure

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
poor

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website is accessible and not blocked by WAF.
  2. No explicit privacy, cookie, or terms of service policies found in the HTML content.
  3. No contact emails or phone numbers explicitly found in the provided HTML snippet.
  4. Uses Google Maps API and Google Tag Manager for functionality and analytics.
  5. Hosted on AWS infrastructure.
  6. Content is in German targeting German users, especially students and temporary renters.
  7. No adult or NSFW content detected.
  8. No visible security headers in the provided data; recommend adding standard security headers.
  9. No structured data (JSON-LD) or Open Graph meta tags beyond basic image and canonical link found.
  10. No forms detected in the provided HTML snippet.
Technical notes

Notes

The website uses a modern JavaScript-based frontend with integration of Google Maps API and Google Tag Manager, hosted on AWS infrastructure as indicated by the nameservers. The site includes responsive design elements and meta tags for SEO optimization. However, no CMS or backend technology was explicitly detected. Performance is moderate with room for optimization. Accessibility is basic, and no structured data (JSON-LD) was found to enhance search engine understanding. The site would benefit from improved technical SEO and accessibility compliance. No broken elements or errors were detected in the provided HTML snippet.
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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