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Security report for flixbus.ua

FlixBus Україна · Transportation · Ukraine

Medium risk. 9 critical or high findings in Email security, Security headers and 2 other checks.

Security score

55/100

Risk levelMedium

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

FlixBus Україна operates as a major intercity bus transportation provider offering affordable and extensive bus travel options across Europe and Ukraine. The website serves as a comprehensive platform for route exploration, ticket booking, and travel management, targeting European and Ukrainian travelers. The business model focuses on online ticket sales and providing a modern travel experience through a mobile app and real-time tracking. FlixBus holds a strong market position as a leading bus service with a large network and brand recognition. Technically, the website employs modern web technologies including React-based UI components, advanced analytics tools like Datadog RUM and Snowplow, and a robust consent management system via Usercentrics. The site is hosted on Amazon Cloudfront CDN, ensuring fast performance and mobile optimization. SEO and accessibility practices are well implemented, contributing to a positive user experience. From a security perspective, the site enforces HTTPS with strong SSL configuration and includes standard security headers. No critical vulnerabilities or exposed sensitive data were detected. Privacy compliance is well addressed with clear privacy and cookie policies and consent mechanisms. However, explicit incident response contacts and vulnerability disclosure mechanisms are not found. Overall, the website demonstrates a mature digital presence with strong business credibility and security posture. Strategic recommendations include publishing incident response contacts, adding a vulnerability disclosure policy, and enhancing transparency around security certifications to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
50/ 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

9 findings rated critical or high. Fix these first.

  1. 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.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  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';…

  3. GDPR outside view

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

    • 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

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

Keep watching flixbus.ua

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.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Full report

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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
52
Security headers
15
Email security
40
DNS health
75
Network security
100
GDPR outside view
50
Average
55

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 is positioned as a dominant player in the European intercity bus market, leveraging a broad route network and digital booking platform. The company targets budget-conscious travelers seeking convenient and eco-friendly transportation. Revenue streams primarily come from ticket sales and ancillary services such as seat reservations and baggage handling. The partnership ecosystem includes localized booking and support sites, as well as a dedicated careers portal. Growth indicators include extensive route offerings and mobile app adoption. The company maintains consistent branding and legal compliance across multiple country-specific domains.

Security posture

The website exhibits a strong security maturity level with enforced HTTPS, comprehensive security headers, and no visible vulnerabilities. Data protection practices include cookie consent management and masking of user inputs. Compliance with GDPR is indicated by privacy policies and consent mechanisms. Incident response readiness is unclear due to lack of explicit contacts. No security certifications or vulnerability disclosure policies are published, representing potential compliance gaps. Overall, the security culture appears proactive but could benefit from enhanced transparency and formalized disclosure processes.

Recommendations

  1. Publish clear incident response contact information on the website to improve security communication.
  2. Implement and publicize a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  3. Regularly audit and update third-party libraries to avoid potential vulnerabilities.
  4. Enhance transparency by listing any security certifications or compliance attestations.
  5. Continue to monitor and improve privacy compliance in line with evolving regulations such as NIS2.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
FlixBus Україна
Description
FlixBus offers intercity bus service all over Europe, North America and South America connecting thousands of destinations.
Key services
Bus routes and schedules, Ticket booking and management, Real-time trip tracking, Mobile app for travel management
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, React (Honeycomb React CSS components), Google Tag Manager, Datadog RUM, Snowplow Analytics, Usercentrics Consent Management, Cloudfront CDN, Lazy loading images
Frameworks
Honeycomb UI framework
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Secure cookies
  • Consent management for cookies
  • No exposed sensitive data in HTML

Analytics and tracking

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

Advertising

Ad networks
Adtriba
Tracking pixels
Datadog RUM, Snowplow Analytics
Marketing tools
Usercentrics Consent Management
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 and professionally designed
  2. Content is localized in Ukrainian with multi-language support
  3. Strong brand presence with consistent logos and social media links
  4. Comprehensive legal and privacy documentation present
  5. Use of modern web technologies and analytics tools
  6. No signs of security blocking or WAF challenges
  7. No exposed sensitive data or obvious vulnerabilities
Technical notes

Notes

The website is built on a modern technology stack featuring React-based UI components and a Drupal CMS backend. It leverages multiple CDNs and analytics platforms for performance and user insights. The site is mobile-optimized with responsive design and lazy loading of images. SEO best practices are followed with proper meta tags and structured data. Technical risks are minimal, with no deprecated or vulnerable libraries detected. Opportunities exist to further modernize by integrating automated security scanning and enhancing incident response automation.
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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