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Security report for flixbus.es

FlixBus España · Transportation · Spain

Medium risk. 8 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

59/100

Risk levelMedium

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

FlixBus España operates as a major intercity bus transportation provider offering affordable travel options across Spain and Europe. The company leverages a robust online platform and mobile app to facilitate ticket booking, real-time travel tracking, and customer service. Their extensive network covers thousands of destinations in over 40 countries, positioning them as a leading player in the European transportation market. The website reflects a mature digital infrastructure with modern technologies such as Drupal CMS, CDN delivery, and advanced analytics tools like Datadog RUM. The site is well-optimized for mobile and accessibility, providing a seamless user experience. Security posture is strong with HTTPS enforced and session replay configured to mask user inputs, though explicit security headers could be improved. Privacy compliance is evident with comprehensive policies and cookie consent mechanisms. Overall, the site demonstrates high professionalism and trustworthiness, supporting Flix SE's brand reputation.

Scanned

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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

8 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

  2. 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • 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';…

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

Keep watching flixbus.es

This scan found 25 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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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
72
Security headers
15
Email security
60
DNS health
80
Network security
100
GDPR outside view
25
Average
59

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

FlixBus's market position is strong as a large transportation entity with a diversified service portfolio including bus and train subsidiaries. Their business model focuses on digital-first ticket sales and customer engagement through apps and web platforms. The company targets a broad audience of travelers seeking cost-effective and sustainable transport solutions. Partnerships with advertising and analytics providers enhance marketing effectiveness. The multilingual site and extensive route coverage indicate a strategic focus on European and international markets. The absence of direct contact details on the homepage suggests centralized customer support likely handled via dedicated portals. FlixBus's sustainability initiatives and customer satisfaction focus are key competitive advantages.

Security posture

The website employs HTTPS with secure session management and uses Datadog RUM for monitoring user interactions and performance. However, no explicit security headers like Content-Security-Policy or X-Frame-Options were detected in the HTML source, representing an area for improvement. No exposed sensitive data or vulnerable libraries were identified. The lack of published security policies or incident response contacts limits transparency. Overall, the security posture is solid but could benefit from enhanced header configurations and public security documentation to improve trust and compliance.

Recommendations

  1. Implement and enforce security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  2. Publish a dedicated security policy and incident response contact information on the website.
  3. Regularly audit third-party scripts and dependencies for vulnerabilities and update accordingly.
  4. Enhance transparency by providing clear data retention and privacy practices related to analytics and tracking.
  5. Consider adding direct customer support contact details or chat options to improve user trust and assistance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
FlixBus España
Description
FlixBus offers intercity bus service all over Europe, North America and South America connecting thousands of destinations.
Key services
Intercity bus travel, Online ticket booking, Mobile app for booking and travel tracking, Customer service and travel management
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Datadog RUM, Cloudfront CDN, Honeycomb UI components
Frameworks
Drupal CMS
Platforms
Web, Mobile app
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of secure cookies
  • Session replay with masking user input

Analytics and tracking

Services
Datadog RUM
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Adjust
Tracking pixels
Datadog RUM
Marketing tools
Datadog RUM, Adjust
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 no blocking detected
  2. WHOIS data is unavailable due to query restrictions, limiting domain registration insights
  3. Strong brand presence with multilingual support and extensive route information
  4. Good privacy and cookie policies with consent mechanisms implemented
  5. No direct contact emails or phone numbers found on main page; likely handled via support portal
  6. Use of modern web technologies and analytics tools with privacy considerations
  7. No security headers explicitly detected in HTML but HTTPS and secure cookies used
  8. No visible vulnerabilities or exposed sensitive data
  9. Content is safe and suitable for general audiences
  10. Social media and app presence well integrated
Technical notes

Notes

The website is built on Drupal CMS and utilizes modern JavaScript frameworks and CDN services for fast content delivery. It integrates advanced analytics and session replay tools to monitor performance and user behavior. The site is mobile-optimized with responsive design and accessibility features. The use of multiple preconnect and preload directives indicates performance optimization efforts. However, the absence of visible security headers and limited WHOIS data due to query restrictions are technical gaps. Hosting appears to be on cloud infrastructure with CDN acceleration, supporting scalability and reliability. Overall, the technical implementation is robust with room for security enhancements.
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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