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Security report for flixbus.co.uk

FlixBus UK · Transportation · United Kingdom

Partial score · DNS & email only

73/100

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

FlixBus UK operates as a major intercity coach travel provider offering affordable and extensive bus services across the UK and Europe. The company leverages a large network connecting thousands of destinations with modern amenities such as free Wi-Fi and real-time trip tracking. Their business model focuses on digital ticketing and app-based booking, targeting general consumers seeking cost-effective and sustainable travel options. The website reflects a mature, well-established brand with consistent branding and professional content. Technically, the website employs modern web technologies including React, Honeycomb UI framework, and cloud-based CDN hosting via AWS Cloudfront. It integrates multiple analytics and marketing tools such as Google Tag Manager, Datadog RUM, and Usercentrics for GDPR compliance. The site is mobile-optimized, accessible, and performs well with fast load times and good SEO practices. From a security perspective, the site enforces HTTPS and uses consent management platforms to comply with privacy regulations. While explicit security headers are not fully enumerated, the overall posture is strong with no visible vulnerabilities or exposed sensitive data. However, the absence of explicit incident response or security policy pages suggests room for improvement in transparency. Overall, the website is trustworthy, professional, and well-aligned with the company's business goals. The lack of WHOIS data for the www subdomain is explained by UK domain registration rules and does not detract from legitimacy. Strategic recommendations include enhancing visible security policies, verifying all security headers, and expanding contact information for improved user trust.

Scanned

3 of 7 checks could not complete. The site may be unreachable or blocking automated scans, so the results below cover only what could be checked. Try a rescan later.

NIS2 and GDPR posture

NIS2 outside view
Not assessed
GDPR outside view
Not assessed

Both readouts depend on the site's pages, which could not be loaded in this scan.

Priority findings

1 finding rated critical or high. Fix these first.

  1. 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

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Keep watching flixbus.co.uk

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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
67
Email security
60
DNS health
65
Network security
100
Average
73

Not counted

  • Security headers: did not complete in this scan.
  • GDPR outside view: did not complete in this scan.
  • 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

FlixBus UK holds a strong market position as a large transportation provider specializing in intercity coach travel. Their competitive advantage lies in a vast route network, digital-first booking experience, and sustainability initiatives. Revenue streams primarily come from ticket sales and ancillary services like airport transfers. The target customer segments include budget-conscious travelers, commuters, and environmentally aware consumers. Growth indicators include app adoption, international expansion, and integration of real-time tracking. The partnership ecosystem includes subsidiaries like FlixTrain and Greyhound, enhancing multimodal transport offerings. Operationally, the company demonstrates digital maturity and a customer-centric approach with continuous service improvements.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, use of a consent management platform, and integration of reputable analytics and marketing tools. No critical vulnerabilities or exposed sensitive data were detected. However, the absence of explicit security or incident response policies and limited visible security headers indicate potential compliance gaps. The company should consider publishing detailed security policies and incident response procedures to enhance transparency and readiness. Overall, the security maturity is good but can be improved by formalizing governance documentation and continuous monitoring of third-party scripts.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency and user trust.
  2. Conduct a comprehensive security headers audit and implement any missing recommended headers such as Content-Security-Policy and X-Content-Type-Options.
  3. Regularly review and update third-party scripts to mitigate risks from vulnerable libraries or tracking tools.
  4. Enhance contact information availability, including verified company emails and phone numbers, to improve customer support and compliance.
  5. Develop a long-term security strategy including data protection officer designation and vulnerability disclosure program.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
FlixBus UK
Description
FlixBus offers intercity bus service all over Europe, North America and South America connecting thousands of destinations.
Key services
Coach travel across UK and Europe, Airport transfers, Real-time trip tracking, Mobile app ticketing
Content quality
excellent
Branding
consistent

Technology

Stack
React (hydrated class indicates React hydration), Honeycomb UI framework, Google Tag Manager, Datadog RUM, Usercentrics CMP, Adjust SDK, Cloudfront CDN
Frameworks
Honeycomb, React
Platforms
AWS Cloudfront CDN
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of security-focused third party scripts
  • Consent management platform (Usercentrics) for GDPR compliance

Analytics and tracking

Services
Google Analytics (via GTM), Datadog RUM
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Adtriba
Tracking pixels
Datadog RUM
Marketing tools
Adjust, Usercentrics CMP
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 no blocking or WAF challenges.
  2. Content is rich, professionally presented, and relevant to coach travel.
  3. Strong branding and consistent design across pages.
  4. Use of modern web technologies and compliance tools.
  5. No contact emails or phone numbers explicitly found on main page.
  6. WHOIS data for www.flixbus.co.uk subdomain is unavailable due to Nominet rules; likely domain is flixbus.co.uk.
  7. Privacy and cookie policies are present and comprehensive.
  8. Social media presence is strong with official accounts linked.
  9. No security or incident response policies explicitly found on main page.
Technical notes

Notes

The website is built on a modern technology stack featuring React and Honeycomb UI framework, hosted on AWS Cloudfront CDN for performance and scalability. It uses Drupal CMS inferred from asset paths. The site is optimized for mobile devices and accessibility, with asynchronous loading of scripts and preloading of critical assets. Integration of multiple analytics and marketing tools indicates a mature digital marketing infrastructure. Performance is fast with good SEO and accessibility practices. Technical risks include reliance on multiple third-party scripts which require ongoing security monitoring. Overall, the technical infrastructure supports a robust and user-friendly digital experience.
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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