Skip to main content

Security report for kayak.de

Transportation · Germany

Medium risk. 7 critical or high findings in GDPR outside view and Security headers.

Security score

63/100

Risk levelMedium

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

The analyzed page is a CAPTCHA verification gateway for kayak.de, a prominent travel metasearch platform serving primarily the German market. This page is designed to prevent automated access and ensure that visitors are legitimate users before allowing entry to the main site. Due to this security mechanism, the actual business content and detailed information are not accessible on this page. The technical infrastructure includes Google reCAPTCHA Enterprise, indicating a strong focus on bot mitigation and security. However, the page lacks visible privacy, cookie, or terms of service policies, and no contact or business details are present, limiting the ability to assess compliance and business credibility fully. The security posture benefits from the CAPTCHA implementation but lacks visible security headers and other best practices on this page. Overall, the site is partially blocked by security controls, resulting in a low AI score and incomplete analysis.

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

7 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 kayak.de

This scan found 22 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.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
95
Security headers
20
Email security
70
DNS health
70
Network security
100
GDPR outside view
25
Average
63

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 kayak.de, from OffSeq Breach.

Total records
931
Employees
0
Customers
878
Third parties
53
Weak passwords
13%

7 subdomains 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 kayak.de.

Select it in the checkout above.

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

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

Business context

Business profile

Kayak.de operates as a major online travel metasearch engine, aggregating flight, hotel, and car rental options for consumers. It is part of a larger ecosystem of travel brands, as indicated by references to sister sites such as momondo and cheapflights. The business model focuses on providing comparative pricing and booking facilitation. The CAPTCHA page suggests a high volume of traffic and the need for robust bot protection. No direct business contact or policy information is available on this page, which is typical for security challenge pages but limits transparency. The domain and DNS configuration appear consistent with a legitimate, established business in the transportation sector.

Security posture

The security posture on this CAPTCHA page is focused on bot mitigation using Google reCAPTCHA Enterprise, a strong and modern security control. However, the absence of visible security headers and lack of privacy or cookie policy disclosures on this page reduce overall security and compliance maturity. No vulnerabilities or exposed sensitive data were detected on this page. The CAPTCHA mechanism effectively blocks automated access but also restricts content visibility, impacting the ability to fully assess security practices across the entire site. Incident response and vulnerability disclosure information are not present here.

Recommendations

  1. Implement and expose comprehensive privacy and cookie policies accessible even on CAPTCHA pages.
  2. Add security headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options to enhance security posture.
  3. Provide clear contact information or links to corporate and security contacts on accessible pages.
  4. Ensure SSL/TLS configuration is strong and verify with external tools.
  5. Consider adding a publicly accessible vulnerability disclosure or security.txt file to improve transparency.
Site observations

Automated reading of the public site. Ratings are indicative.

Generic detected. The page is a CAPTCHA challenge page indicating bot mitigation or security filtering blocking direct access to the main content. These observations may be incomplete. For a fuller analysis, contact guard@offseq.com.

Business

Description
The website is a CAPTCHA verification page for kayak.de, a travel fare aggregator and travel metasearch engine primarily serving the German market. The page is designed to confirm that the visitor is a real user before granting access to the main site.
Key services
Flight search, Hotel search, Car rental search
Content quality
poor
Branding
consistent

Technology

Stack
Google reCAPTCHA Enterprise, Fetch API, JavaScript, CSS
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
poor

Security

Observed score
40/100
Good practices seen
  • Use of Google reCAPTCHA Enterprise for bot mitigation

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

Design
poor
User experience
poor
Content relevance
poor
Navigation
poor
Professionalism
poor
Trustworthiness
moderate

Key observations

  1. Website content is blocked behind a CAPTCHA challenge page.
  2. No privacy, cookie, or terms of service policies found on this page.
  3. No contact information or business details are present on this page.
  4. Use of Google reCAPTCHA Enterprise indicates advanced bot mitigation.
  5. Page is minimal and serves only as a security checkpoint.
  6. No analytics or tracking scripts detected beyond reCAPTCHA.
  7. No security headers visible in the provided data.
  8. No forms other than the CAPTCHA response submission.
  9. No social media or external business contact links present.
  10. Branding is consistent with Kayak and related travel brands.
Technical notes

Notes

The page uses modern JavaScript and Google reCAPTCHA Enterprise for bot detection, indicating a mature technical approach to security. Assets are hosted on Amazon S3, a reliable cloud provider. The page is minimalistic with limited content, resulting in basic mobile optimization and accessibility. SEO is poor due to the lack of meta tags beyond the title and robots meta tag instructing no indexing. No CMS or frameworks are explicitly detected. Performance is moderate given the lightweight nature of the page. The technical debt appears low for this specific page but the overall site cannot be assessed due to blocking.
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

Reviews of this site

Share your experience with kayak.de. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review kayak.de.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.