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Security report for checkout.com

Checkout · Finance · United Kingdom

Low risk. 2 critical or high findings in Security headers and SSL/TLS.

Security score

83/100

Risk levelLow

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

Checkout.com is a leading global payment service provider offering a comprehensive suite of payment processing solutions, including online payment acceptance, fraud detection, identity verification, and payout services. The company targets businesses seeking to optimize payment performance and reduce fraud risks, positioning itself as a technology-driven enterprise in the finance sector. The website reflects a mature digital presence with professional design, clear navigation, and extensive product offerings. Technically, the site leverages modern web technologies such as Webflow CMS, Amazon Cloudfront hosting, and integrates multiple analytics and marketing tools including Google Analytics, Hotjar, and OneTrust for privacy compliance. Security posture is strong with HTTPS enforcement, security headers, and cookie consent mechanisms, although explicit security policies and incident response details are not publicly disclosed. The absence of WHOIS data reduces transparency but does not significantly detract from the overall trustworthiness given the company's evident market position and certifications like ISO 27001. Overall, the website demonstrates a high level of professionalism, technical sophistication, and compliance with privacy regulations.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
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

2 findings rated critical or high. Fix these first.

  1. 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

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching checkout.com

This scan found 13 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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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
75
Security headers
65
Email security
87
DNS health
85
Network security
100
GDPR outside view
88
Average
83

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 checkout.com, from OffSeq Breach.

Total records
10,212
Employees
6
Customers
10,035
Third parties
171
Weak passwords
8%

Latest record dated 2025-11-14 · 35 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 checkout.com.

Select it in the checkout above.

Masked preview

  • –sandbox.checkout.com2025-11-14
  • –hub.checkout.com2025-11-02
  • –hub.checkout.com2025-08-22
  • –sandbox.checkout.com2025-07-09
  • –hub.checkout.com2025-06-24

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

Checkout.com operates in the finance and technology sectors, providing payment infrastructure and fraud prevention services to enterprise clients globally. Its business model centers on API-driven payment processing, enabling merchants to accept payments across multiple channels and geographies. The company maintains a strong partnership ecosystem, including social media presence on Facebook, Twitter, LinkedIn, and Instagram, enhancing brand visibility. The product portfolio is broad, covering acquiring, issuing, payouts, fraud detection, and more, indicating a diversified revenue stream. The website content and structure suggest a focus on large businesses and enterprises, with a consistent branding strategy and trust signals such as certifications and client testimonials. The lack of detailed WHOIS information is a minor concern but common among large enterprises using privacy services. Strategic observations include the need for enhanced transparency in security policies and vulnerability disclosures to further strengthen trust.

Security posture

The security maturity of Checkout.com’s website is high, with HTTPS enforced site-wide, comprehensive security headers implemented, and a robust cookie consent mechanism aligned with GDPR requirements. The use of third-party analytics and marketing scripts is extensive but managed with consent controls. No exposed sensitive data or vulnerable libraries were detected in the HTML content. However, the absence of a publicly available security policy, incident response plan, or vulnerability disclosure program limits transparency and may impact stakeholder confidence. The website would benefit from publishing explicit security documentation and a security.txt file to facilitate responsible vulnerability reporting. Overall, the security posture supports business continuity and data protection but could improve in communication and incident readiness.

Recommendations

  1. Publish a detailed security policy and incident response plan on the website to enhance transparency.
  2. Implement and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  3. Provide clear contact information for the Data Protection Officer or security team to improve compliance and trust.
  4. Regularly audit and update third-party scripts to mitigate potential security risks.
  5. Update WHOIS registration details to improve domain transparency and trustworthiness.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Checkout
Description
Boost your acceptance rate, cut processing costs, fight fraud, and create extraordinary customer experiences with Checkout.com's payment solutions.
Key services
Accept Online Payments, Unified Payments API, Fraud Detection, Authentication, Identity Verification, Disputes Management, Vault for Payment Data, Payouts, Acquiring, Mobile SDK
Content quality
excellent
Branding
consistent

Technology

Stack
Google Tag Manager, Google Analytics, Hotjar, OneTrust, Optimizely, Cloudfront CDN, Webflow CMS, JavaScript, CSS3, HTML5
Frameworks
Webflow
Platforms
Cloudfront, Google Cloud
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism
  • Use of CSP headers
  • No exposed sensitive data in HTML
  • Secure forms with no visible vulnerabilities

Analytics and tracking

Services
Google Analytics, Hotjar, LinkedIn Insight, Facebook Pixel, Bing UET
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Taboola, Bing Ads, Twitter Ads, Facebook Ads
Tracking pixels
Hotjar, Facebook Pixel, LinkedIn Insight Tag, Bing UET
Marketing tools
Optimizely
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 no blocking or WAF challenge.
  2. Content is business-oriented, targeting payment processing clients.
  3. Strong use of modern web technologies and tracking tools.
  4. Comprehensive cookie and privacy consent mechanisms implemented.
  5. WHOIS data unavailable, which is a minor trust concern.
  6. No security policy or incident response info publicly found.
  7. No vulnerability disclosure or security.txt detected.
  8. Multiple social media and external trusted domains linked.
  9. Website design and UX are professional and consistent.
Technical notes

Notes

The website is built on a modern technology stack including Webflow CMS, Amazon Cloudfront CDN, and integrates multiple analytics and marketing tools such as Google Tag Manager, Hotjar, and Optimizely. The site demonstrates fast loading times, excellent mobile optimization, and good accessibility features. SEO is well addressed with proper meta tags, Open Graph data, and structured JSON-LD schema for organization and contact information. The technical infrastructure supports a scalable and performant user experience suitable for enterprise clients. Opportunities for modernization include enhanced security documentation and streamlining third-party script usage to reduce potential attack surface.
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. 76/100Low20 findingsView report
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