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Security report for brennangroup.co.uk

Brennan Group · Real Estate · United Kingdom

Medium risk. 3 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

58/100

Risk levelMedium

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

Brennan Group is a well-established UK-based chartered building company founded in 2000, specializing in delivering construction projects across multiple sectors including prime residential, commercial, science & technology, and more. The company positions itself as a trusted partner for high-profile clients, emphasizing close collaboration with clients and professional teams. Their website showcases a professional portfolio of projects, certifications, and client logos, reflecting a strong market presence in the construction industry. Technically, the website employs modern web technologies such as Alpine.js and Swiper.js, with a responsive design optimized for mobile devices. Hosting is provided by a reputable UK registrar, and the site uses HTTPS with a cookie consent mechanism, indicating a good level of digital maturity. However, some security best practices like security headers and incident response information are missing. From a security perspective, the site benefits from HTTPS and cookie consent but lacks explicit security policies or vulnerability disclosure mechanisms. No critical vulnerabilities or exposed sensitive data were detected. The WHOIS data aligns well with the business claims, showing a long-standing domain registration that supports the company's legitimacy. Overall, Brennan Group's website is professional, trustworthy, and compliant with privacy regulations, with room for improvement in security headers and incident response transparency. The risk level is low, but enhancing security policies and disclosures would further strengthen their posture.

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 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

  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.

    • 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

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

Keep watching brennangroup.co.uk

This scan found 26 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
47
Security headers
50
Email security
75
DNS health
65
Network security
40
GDPR outside view
68
Average
58

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

Brennan Group operates in the UK construction sector with a focus on delivering high-quality building projects across diverse sectors. Their competitive advantage lies in their chartered status, extensive project portfolio, and recognized certifications. The business model centers on project delivery and management for private and commercial clients. The website targets clients seeking reliable construction partners, showcasing completed projects and client testimonials. Growth indicators include recent project completions and active news updates. Partnerships with certification bodies and a professional digital presence support their market credibility. Strategic observations suggest leveraging their certifications and expanding digital security transparency to enhance client trust.

Security posture

The website demonstrates a moderate to good security maturity level with HTTPS enforced and a cookie consent mechanism in place. However, the absence of security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security reduces the overall security posture. No incident response or vulnerability disclosure information is provided, which could hinder timely reporting and mitigation of security issues. Data protection practices appear adequate with GDPR-compliant privacy and cookie policies. No exposed sensitive data or vulnerable libraries were detected. The security culture could be improved by publishing explicit security policies and providing dedicated security contact channels.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance protection against common web attacks.
  2. Publish an incident response policy and provide dedicated security contact channels such as security@ or abuse@ email addresses.
  3. Develop and publish a vulnerability disclosure policy or security.txt file to encourage responsible reporting of security issues.
  4. Enhance accessibility features to improve compliance and user experience for all visitors.
  5. Regularly audit and update third-party libraries and scripts to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Brennan Group
Description
Successfully delivering construction projects for some of the country’s most respected organisations, working closely with both clients and their professional teams.
Key services
Construction project delivery, Design and build, Project management
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, Alpine.js, Swiper.js
Frameworks
Alpine.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Marketing tools
Mailchimp
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and well-structured.
  2. Clear navigation with comprehensive sector and project information.
  3. Cookie consent banner implemented with accept/decline options.
  4. Multiple certifications and client logos displayed enhancing trust.
  5. No security.txt or explicit security policy pages found.
  6. No phone numbers explicitly labeled as company contact found in HTML.
  7. Email contact info is provided in footer and contact page.
  8. Social media presence on LinkedIn and Instagram confirmed.
  9. Use of modern JavaScript libraries like Alpine.js and Swiper.js.
  10. No signs of WAF or content blocking detected.
Technical notes

Notes

The website is built using modern front-end technologies including Alpine.js for reactive components and Swiper.js for interactive sliders. The HTML and CSS are valid and structured, supporting responsive design and mobile optimization. Hosting is managed by a UK-based registrar with a long-standing domain registration. Performance is moderate with optimized images and lazy loading implemented. SEO is basic with meta tags and Open Graph data present but could be improved with richer structured data. No CMS is detected, indicating a custom or static site approach. Technical risks include missing security headers and limited accessibility features, which should be addressed to improve robustness and compliance.
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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