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Security report for bdo.de

BDO AG Wirtschaftsprüfungsgesellschaft · Finance · Germany

Low risk. No critical or high findings.

Security score

86/100

Risk levelLow

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

BDO AG Wirtschaftsprüfungsgesellschaft is a large, established German professional services firm specializing in audit, tax, advisory, and business services outsourcing. The company serves a broad range of industries including finance, healthcare, energy, and government sectors. Their website reflects a mature digital presence with comprehensive content, clear navigation, and strong branding consistent with an international network member. Technically, the site uses modern frameworks such as React and Kentico CMS, supported by robust analytics and consent management tools. Security posture is solid with HTTPS enforced and privacy compliance evident through GDPR-aligned policies and cookie consent mechanisms. No critical vulnerabilities or suspicious indicators were found. Overall, the site projects professionalism, trustworthiness, and compliance, suitable for its target audience of corporate clients and professionals.

Scanned

NIS2 and GDPR posture

GDPR outside view
100/ 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

No critical or high findings. These medium findings are worth fixing next.

  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.

    • Medium

      Missing X-XSS-Protection header

      Legacy XSS protection (deprecated but still recommended)

      What to do: Add "X-XSS-Protection: 1; mode=block"

    • Medium

      Missing Permissions-Policy header

      Controls browser features and APIs

      What to do: Implement a Permissions-Policy to restrict feature access

      • OWASP Secure Headers: OWASP Secure Headers Project recommends Permissions-Policy: accelerometer=(), autoplay=(), camera=(), cross-origin-isolated=(),…

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Medium

      No MTA-STS Policy

      MTA-STS enforces TLS for email delivery

      What to do: Implement MTA-STS to prevent downgrade attacks

  3. 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.

    • Medium

      SSL Certificate Expires Within 90 Days

      SSL certificate expires in 72 days

      What to do: Plan SSL certificate renewal

  4. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • Medium

      DNSSEC Not Enabled

      DNSSEC is not configured for this domain

      What to do: Enable DNSSEC to prevent DNS spoofing attacks

      • CAPEC-142
      • RFC 4033
      • RFC 4035

Keep watching bdo.de

This scan found 15 issues across 5 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
95
Security headers
70
Email security
80
DNS health
70
Network security
100
GDPR outside view
100
Average
86

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

BDO positions itself as a key player in the German and international audit and advisory market, leveraging its membership in BDO International. The firm offers a wide range of services tailored to various sectors, emphasizing sustainability, cyber security, and digital transformation. The website content and structure indicate a focus on corporate clients, public sector entities, and emerging industries. The presence of detailed insights, events, and career information suggests active engagement with stakeholders and talent acquisition. The business model is service-oriented with revenue streams from audit, tax consulting, advisory, and outsourcing. Partnerships and social media presence enhance its market reach and credibility.

Security posture

The website demonstrates a mature security posture with HTTPS enforced, use of cookie consent management (Cookiebot), and anonymized IP tracking in analytics. However, explicit security headers are not evident in the provided data, and no dedicated security or incident response pages were found. There is no visible security.txt or vulnerability disclosure policy. The absence of exposed sensitive data and use of reputable third-party services contribute positively. Overall, the security maturity is good but could be improved by adding explicit security headers and public incident response information.

Recommendations

  1. Implement and verify HTTP security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to enhance protection against common web attacks.
  2. Publish a dedicated security policy or incident response page including contact channels for reporting security issues to improve transparency and trust.
  3. Consider adding a security.txt file at the root domain to facilitate responsible vulnerability disclosure.
  4. Regularly audit third-party scripts and libraries to ensure no vulnerable components are included.
  5. Enhance accessibility features and continue optimizing mobile responsiveness to maintain excellent user experience across devices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
BDO AG Wirtschaftsprüfungsgesellschaft
Description
Die Berater und Experten von BDO bieten Wirtschaftsprüfung, Steuerberatung, Unternehmensberatung und mehr. Sie unterstützen Unternehmen in verschiedenen Branchen mit maßgeschneiderten Lösungen.
Key services
Audit & Assurance, Tax & Legal, Advisory, Business Services Outsourcing (BSO), Sustainability Services, Cyber Security
Content quality
excellent
Branding
consistent

Technology

Stack
React, Kentico CMS, jQuery, Google Tag Manager, Cookiebot, Microsoft Application Insights
Frameworks
React
Platforms
Kentico Content Management System
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced with forceSSL in Google Analytics
  • Cookie consent management with Cookiebot
  • IP anonymization in Google Analytics
  • Security storage granted in consent settings

Analytics and tracking

Services
Google Analytics, Microsoft Application Insights
Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
Google Analytics (gtag)
Marketing tools
Cookiebot
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and professional design.
  2. Strong focus on compliance with GDPR and cookie consent.
  3. No exposed sensitive data or security vulnerabilities detected in source.
  4. Use of modern web technologies and CMS (Kentico, React).
  5. Comprehensive business services and industry coverage.
  6. Social media presence on LinkedIn, Facebook, and YouTube.
  7. No signs of suspicious or malicious activity.
Technical notes

Notes

The website is built on a modern technology stack including React for frontend rendering and Kentico CMS for content management. It uses jQuery for legacy support and integrates Google Tag Manager and Microsoft Application Insights for analytics and monitoring. Fonts are loaded from Google Fonts and cdnfonts.com with preconnect and preload optimizations. Cookiebot manages GDPR-compliant consent. Hosting appears to be with Deutsche Telekom based on nameservers. Performance is moderate with good mobile optimization and accessibility. The site uses canonical and hreflang tags for SEO and supports multiple languages (German and English). There is room for improvement in security headers and performance tuning.
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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