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Security report for flights-idealo.co.uk

idealo.de · Transportation · United Kingdom

Medium risk. 5 critical or high findings in DNS health, Security headers and 1 other check.

Security score

70/100

Risk levelMedium

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

Flights-idealo.co.uk is a UK-targeted flight price comparison website operated by idealo internet GmbH, a well-established company in the online price comparison market. The platform aggregates flight offers from numerous airlines and travel agents, providing users with a comprehensive and user-friendly interface to find cheap flights quickly. The website is part of the idealo brand family, which operates multiple regional sites, enhancing its market presence and trustworthiness. Technically, the site employs modern web technologies including React, Apollo GraphQL, and styled components, ensuring a responsive and performant user experience. The use of HTTPS and consent management tools like Usercentrics demonstrates a commitment to security and privacy compliance. However, the WHOIS data for the domain is unavailable due to a domain registration error related to naming rules, which does not appear to impact the legitimacy or operation of the site. Security posture is good but could be improved by adding explicit security headers and publishing a security policy. Overall, the site is professional, trustworthy, and well-positioned in the flight comparison market.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

5 findings rated critical or high. Fix these first.

  1. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • Critical

      DNS Resolution Failed

      Unable to resolve domain A records

      What to do: Verify domain is properly configured and not expired

    • High

      No Name Servers Found

      Unable to find name servers for domain

      What to do: Configure proper name servers for the domain

  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 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 Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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

Keep watching flights-idealo.co.uk

This scan found 18 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
100
Security headers
60
Email security
65
DNS health
40
Network security
100
GDPR outside view
53
Average
70

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

The business operates in the transportation sector, focusing on flight price comparison for UK and international travelers. Its competitive advantage lies in aggregating a vast number of flight offers and providing intelligent filtering options to users. Revenue is likely generated through partnerships with travel agencies and airlines, as well as advertising. The target audience includes frequent flyers, budget travelers, and consumers seeking the best flight deals. The company benefits from a strong brand presence under idealo, with multiple related domains serving different regions. Growth potential exists through expanding partnerships and enhancing user experience. The ecosystem includes related idealo domains and trusted travel partners, reinforcing market credibility.

Security posture

The website demonstrates a mature security posture with HTTPS enforced and use of a consent management platform for GDPR compliance. No critical vulnerabilities or exposed sensitive data were detected in the HTML content. However, the absence of explicit security headers such as Content-Security-Policy and X-Frame-Options is a gap that should be addressed to enhance protection against common web attacks. There is no publicly available security policy or incident response contact, which limits transparency in security governance. The site does not publish a vulnerability disclosure or security.txt file, which could improve security collaboration with researchers. Overall, the security maturity is good but can be improved with additional best practices and transparency.

Recommendations

  1. Implement and enforce security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  2. Publish a clear security policy and provide incident response contact information on the website.
  3. Consider adding a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Enhance transparency by providing more detailed privacy and data protection information, including data retention policies.
  5. Regularly audit third-party scripts and dependencies to ensure no vulnerable libraries are used.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
idealo.de
Description
Find and compare cheap flights and check the availability of low airfares with www.flights-idealo.co.uk.
Key services
Flight price comparison, Flight deals aggregation, Travel tips and expert advice
Content quality
good
Branding
consistent

Technology

Stack
React, Apollo GraphQL, Styled Components, Emotion, Google Tag Manager, Usercentrics CMP, Webpack
Frameworks
React
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of consent management platform (Usercentrics)
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
idealo advertising network
Tracking pixels
Usercentrics CMP
Transparency
good

Site quality

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

Key observations

  1. Website is a flight price comparison platform targeting UK users.
  2. Content is rich with flight routes, prices, and travel information.
  3. No signs of malware, phishing, or suspicious content.
  4. WHOIS data is unavailable due to domain registration error.
  5. Uses modern web technologies and consent management.
  6. Clear privacy and cookie policies with GDPR compliance.
  7. Contact phone number provided but no email contact found in HTML.
  8. No explicit security policy or incident response info found.
Technical notes

Notes

The website is built on a modern React-based tech stack with Apollo GraphQL for data management and styled-components/emotion for styling. It uses Webpack for bundling and integrates Google Tag Manager and Usercentrics for analytics and consent management. The site is well optimized for performance and mobile responsiveness, with preloading and preconnecting to critical resources. Accessibility features appear to be implemented at a good level. No CMS is detected, suggesting a custom or proprietary platform. Hosting provider details are not explicit but the use of idealo CDNs indicates a professional hosting environment. The technical infrastructure supports a fast, reliable, and user-friendly experience suitable for a large-scale flight comparison service.
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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