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Security report for adyen.com

Adyen N.V. · Finance · Netherlands

High risk. 3 critical or high findings in Network security and SSL/TLS.

Security score

49/100

Risk levelHigh

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

Adyen N.V. is a leading global payment platform headquartered in the Netherlands, providing end-to-end payment solutions to enterprises worldwide. The company offers a unified platform that connects merchants directly to payment networks, enabling seamless payment processing across online, mobile, and in-store channels. Adyen's market position is strong, serving many global brands and maintaining compliance with key industry standards such as PCI DSS and ISO 27001. The website reflects a mature digital presence with comprehensive service descriptions and clear business focus. Technically, the website employs modern JavaScript frameworks and integrates advanced analytics and optimization tools such as Google Tag Manager and Optimizely. The site is well-optimized for performance and mobile responsiveness, indicating a high level of digital maturity. Security is robust, with HTTPS enforced, strong security headers, and no visible vulnerabilities. The company maintains clear security policies and incident response contacts, demonstrating a proactive security posture. Overall, the risk profile of the website is low. The absence of WHOIS data is noted but likely due to privacy or registry policies common among large enterprises. The site shows strong compliance with privacy regulations including GDPR, with clear privacy and cookie policies and consent mechanisms. Business credibility is high, supported by certifications and transparent contact information. Strategic recommendations include maintaining regular security audits, enhancing transparency in vulnerability disclosures, and continuing to invest in user education on security features to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
100/ 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

3 findings rated critical or high. Fix these first.

  1. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • Critical

      Critical Service Exposed: Telnet

      Port 23 (Telnet) is publicly accessible - Telnet - Unencrypted remote access

      What to do: Immediately restrict access to Telnet using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

  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

      SSL Certificate Expires Soon

      SSL certificate expires in 27 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates
    • 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 adyen.com

This scan found 13 issues across 5 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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Recommended

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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
65
Security headers
75
Email security
85
DNS health
85
Network security
0
GDPR outside view
100
Average
68
After the cap
49

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 · found on this site
  • 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

Adyen operates in the finance and technology sectors, focusing on payment processing services for large enterprises. Its business model is B2B, providing a scalable platform that supports multiple payment methods globally. The company benefits from a strong partnership ecosystem and a reputation for reliability and security. Revenue streams primarily come from transaction fees and value-added services such as risk management and point-of-sale solutions. Target customers include global retailers, marketplaces, and service providers. Growth indicators include continuous expansion of payment methods and geographic reach. The company maintains a consistent brand image and professional online presence, reinforcing its market leadership.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, comprehensive security headers, and adherence to industry standards like PCI DSS and ISO 27001. No critical vulnerabilities or exposed sensitive data were detected. The presence of a dedicated security policy page and incident response contacts indicates readiness to handle security incidents. GDPR compliance is evident through privacy policies and cookie consent mechanisms. The company also holds SOC 2 Type II certification, further validating its security controls. Recommendations include ongoing vulnerability management, penetration testing, and enhancing transparency around vulnerability disclosures to maintain and improve security maturity.

Recommendations

  1. Conduct regular third-party security audits and penetration tests to identify and remediate vulnerabilities.
  2. Enhance public vulnerability disclosure program to encourage responsible reporting and increase transparency.
  3. Maintain up-to-date third-party libraries and dependencies to mitigate risks from known vulnerabilities.
  4. Expand user education initiatives on security best practices and privacy controls to build customer trust.
  5. Develop a long-term security strategy incorporating emerging threats and compliance requirements.

Contact details published on the site

Addresses
Legal name
Adyen N.V.
VAT number
NL817747532B01
Registration number
34216785
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Adyen N.V.
Description
Adyen provides a modern end-to-end payment platform that connects merchants directly to Visa, Mastercard, and other payment methods globally.
Key services
Payment processing, Risk management, Point of Sale solutions, E-commerce payment gateway
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, Optimizely, Various analytics and tracking scripts
Frameworks
React (likely), Custom payment platform frameworks
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of CSP
  • Secure cookies
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Optimizely
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Optimizely
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 rich content
  2. Strong focus on payment processing and enterprise clients
  3. Comprehensive privacy and security policies present
  4. No signs of phishing or malware
  5. Modern technology stack and good performance
  6. No adult or questionable content detected
  7. WHOIS data missing, which is unusual but not uncommon for large enterprises using privacy or proxy services
Technical notes

Notes

The website uses a modern technology stack including JavaScript frameworks, Google Tag Manager, and Optimizely for analytics and optimization. The site is well-structured with proper meta tags and SEO optimizations, contributing to good search engine visibility. Performance is fast with efficient resource loading and mobile optimization. Accessibility features are present but could be further enhanced to meet higher standards. No CMS was explicitly detected, suggesting a custom or proprietary platform. Hosting details are not explicitly disclosed but the site uses secure HTTPS connections and CDN services for content delivery. Overall, the technical infrastructure supports a high-quality user experience and robust business operations.
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. 87/100Low16 findingsView report
  2. 87/100 +13Low16 findingsView report
  3. 74/100Medium20 findingsView report
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