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Security report for wienerwohnen.at

Wiener Wohnen · Government · Austria

Medium risk. 4 critical or high findings in Security headers and SSL/TLS.

Security score

71/100

Risk levelMedium

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

Wiener Wohnen operates as the largest municipal housing provider in Europe, delivering affordable and quality public housing in Vienna. The website serves tenants and prospective tenants with comprehensive information about housing options, application procedures, tenant services, and community news. The organization maintains a strong market position as a key government entity in the real estate sector, focusing on social housing and tenant support. Technically, the website employs modern web technologies including HTML5, CSS3, JavaScript, and integrates multimedia players and accessibility tools such as JWPlayer and ReadSpeaker. The site is mobile-optimized, accessible, and uses Matomo analytics with a clear cookie consent mechanism, reflecting a mature digital infrastructure. From a security perspective, the site enforces HTTPS, uses cookie consent banners, and avoids exposing sensitive data. However, it lacks explicit security policy documentation and incident response contacts, which are recommended for enhanced transparency and readiness. No vulnerabilities or suspicious elements were detected. Overall, the website is professional, trustworthy, and compliant with GDPR requirements. It effectively serves its public sector mission with clear navigation, relevant content, and user-friendly services. Strategic recommendations include publishing a dedicated security policy, incident response information, and implementing additional security headers to further strengthen the security posture.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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

4 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 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. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1
    • High

      SSL Certificate Expires Soon

      SSL certificate expires in 28 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching wienerwohnen.at

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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
32
Security headers
50
Email security
85
DNS health
75
Network security
100
GDPR outside view
83
Average
71

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

Wiener Wohnen holds a dominant position in Vienna's municipal housing market, providing essential social housing services to a large tenant base. Its business model centers on public sector housing provision, tenant engagement, and social support services. The organization leverages partnerships with city government and housing advisory services to streamline housing allocation and tenant support. Growth indicators include new housing projects and targeted initiatives such as affordable housing for students. The website reflects a well-established ecosystem with a focus on transparency, tenant empowerment, and community engagement. Revenue streams are primarily public funding and municipal budgets. The target customer segments include low to moderate income residents, students, and families seeking affordable housing. The partnership ecosystem includes city government portals and housing advisory organizations. Operationally, Wiener Wohnen demonstrates a strong commitment to social responsibility and tenant services.

Security posture

The website demonstrates a solid security maturity level with enforced HTTPS, cookie consent mechanisms, and privacy-conscious analytics usage. No exposed sensitive information or vulnerable libraries were detected. However, the absence of a published security policy and incident response contacts represents a compliance gap. The site does not provide a vulnerability disclosure policy or security.txt file, limiting transparency for security researchers. Overall, the security posture is good but could be improved by formalizing security governance documentation and enhancing HTTP security headers. Compliance with GDPR is evident through privacy and cookie policies. Incident response readiness is unclear due to lack of contact information. The security culture appears mature given the use of privacy-respecting analytics and consent management.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and commitments.
  2. Provide clear incident response contact information (e.g., security@ or abuse@ email).
  3. Implement additional HTTP security headers such as Content-Security-Policy and X-Frame-Options.
  4. Consider publishing a vulnerability disclosure or security.txt file to encourage responsible reporting.
  5. Continue enhancing privacy compliance and transparency around data collection and retention.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Wiener Wohnen
Description
Wiener Wohnen is the largest municipal housing provider in Europe, offering affordable and quality public housing in Vienna. The website provides information for tenants and interested parties about municipal housing, application procedures, news, and services.
Key services
Provision of municipal housing, Tenant services and support, Housing application and allocation, Social counseling, Online tenant portal
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, jQuery, JWPlayer, FlexPaper, Colorbox, Matomo Analytics, ReadSpeaker
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data in HTML
  • Use of secure external analytics (Matomo) with consent

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Matomo
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is comprehensive and relevant to municipal housing in Vienna.
  3. Good implementation of cookie consent and privacy policies.
  4. Use of Matomo analytics with consent indicates privacy awareness.
  5. No visible security vulnerabilities or exposed sensitive data.
  6. No explicit or adult content detected.
  7. Clear navigation and multiple service portals for tenants.
  8. Strong alignment between WHOIS data and website business.
Technical notes

Notes

The website uses a modern and diverse technology stack including HTML5, CSS3, JavaScript, jQuery, JWPlayer for video, FlexPaper for document viewing, and Colorbox for UI elements. It integrates Matomo analytics with cookie consent, reflecting privacy-aware tracking. The site is mobile-optimized and accessible, with skip links and font size controls. Performance is moderate, with caching and minified resources evident. No CMS was explicitly detected, suggesting a custom or proprietary platform. Hosting details are not disclosed. Technical risks are minimal, but modernization opportunities include adding security headers and formalizing CMS or platform details for maintainability.
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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