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Security report for flixbus.sk

Flix SE · Transportation · Slovakia

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 (operated by Flix SE) is a leading low-cost intercity and international bus transportation provider operating extensively in Slovakia and across Europe. The company offers a vast network of over 400,000 daily connections to approximately 2,500 destinations in more than 35 countries. Their business model focuses on affordable, convenient, and environmentally friendly travel options, supported by modern buses equipped with amenities such as free Wi-Fi and power outlets. The website targets general travelers seeking economical and reliable bus transport solutions.

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.sk

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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  • 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
Security headers
15
Email security
70
DNS health
75
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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention flixbus.sk, from OffSeq Breach.

Total records
87
Employees
0
Customers
87
Third parties
0
Weak passwords
10%

1 subdomain affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for flixbus.sk.

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Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

FlixBus holds a strong market position as a dominant player in the European low-cost bus travel sector. Their competitive advantages include a broad route network, user-friendly digital platforms for booking and real-time tracking, and a commitment to sustainability with goals for carbon neutrality. Revenue streams primarily derive from ticket sales via their website and mobile app. The company maintains a robust partnership ecosystem, including subsidiaries like FlixTrain and Greyhound, enhancing their service offerings. Growth indicators include extensive social proof and a large user base exceeding 90 million travelers annually.

Security posture

The website demonstrates a mature security posture with HTTPS enforced, use of modern monitoring tools like Datadog RUM, and secure session management. However, explicit security headers such as Content-Security-Policy and X-Frame-Options are not evident, and no public security or incident response policies are published. There is no visible vulnerability disclosure program or security.txt file, which could improve transparency and trust. Overall, the security measures are adequate for protecting user data and ensuring service availability but could benefit from enhanced policy disclosures and header implementations.

Recommendations

  1. Implement and publish a formal security policy and incident response contact information to improve transparency.
  2. Add comprehensive security headers (e.g., Content-Security-Policy, X-Frame-Options) to strengthen protection against common web attacks.
  3. Establish a vulnerability disclosure program and publish a security.txt file to encourage responsible reporting of security issues.
  4. Enhance contact information availability by providing direct company contact emails or phone numbers for customer and security inquiries.
  5. Continue monitoring and updating third-party libraries and scripts to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Flix SE
Description
Nízkonákladová autobusová doprava. 400 000 denných spojov do približne 2 500 destinácií vo vyše 35 európskych krajinách.
Key services
Bus ticket booking, Bus routes and schedules, Onboard services including Wi-Fi and power outlets, Mobile app for booking and live updates
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Datadog RUM, Honeycomb icons, Drupal CMS assets
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of Datadog RUM for monitoring
  • Session cookies with secure and cross-site flags

Analytics and tracking

Services
Datadog RUM
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Adjust
Tracking pixels
Datadog RUM
Marketing tools
Adjust, Datadog
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 rich content and multiple language options.
  2. Strong brand presence with consistent logos and social media integration.
  3. Good use of modern web technologies and performance optimization.
  4. Privacy and cookie policies are clearly linked and GDPR compliant.
  5. No direct contact emails or phone numbers found on the main page; contact likely via help portal.
  6. No explicit security or incident response policies published on the main site.
  7. No vulnerability disclosure or security.txt file detected.
Technical notes

Notes

The website is built on a Drupal CMS platform, leveraging modern JavaScript libraries and third-party services such as Datadog for real user monitoring and Adjust for marketing attribution. The site is optimized for mobile devices with responsive design and lazy loading of images. Performance is moderate with asynchronous loading of scripts and preconnect hints to improve resource fetching. Accessibility features such as skip links and ARIA roles are implemented, supporting a good user experience. SEO is well addressed with meta tags, canonical links, and hreflang attributes for multilingual support. Technical risks are minimal but could be reduced further by tightening security headers and ensuring all third-party scripts are up to date.
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

Earlier scans of this domain

  1. 60/100Medium33 findingsView report
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