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Security report for customer.io

Peaberry Software Inc. · Technology · United States

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

72/100

Risk levelMedium

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

Customer.io is a well-established SaaS platform specializing in AI-powered customer engagement and marketing automation. The company offers a comprehensive platform that enables businesses to create personalized customer journeys across multiple channels using first-party data. With a strong market presence serving over 7,800 brands globally, Customer.io positions itself as a trusted partner for businesses ranging from startups to large enterprises. The platform emphasizes data integration, automation flexibility, and AI-driven insights to enhance marketing performance and customer relationships. Technically, the website is built on modern frameworks such as Next.js and React, hosted likely on Vercel with DNS managed by AWS. The site demonstrates excellent performance, mobile optimization, and SEO practices. Integration of tools like Google Tag Manager and Sentry indicates a mature approach to analytics and error monitoring. However, some security enhancements such as enabling DNSSEC and publishing a vulnerability disclosure policy could further strengthen their posture. From a security perspective, Customer.io highlights compliance with major standards including ISO 27001, GDPR, HIPAA, SOC 2 Type II, and CCPA, reflecting a strong commitment to data protection and regulatory adherence. The domain registration data aligns well with the business claims, supporting legitimacy and trustworthiness. No critical vulnerabilities or blocking mechanisms were detected, indicating a secure and accessible platform. Overall, Customer.io presents a professional, secure, and credible online presence with room for improvement in privacy policy visibility and DNS security. Strategic enhancements in these areas would bolster user trust and compliance assurance.

Scanned

This is an earlier scan of customer.io. View the latest report

NIS2 and GDPR posture

GDPR outside view
70/ 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. 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 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';…

  2. 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

  3. 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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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

Keep watching customer.io

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.

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Full report

€39.90one-time

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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
72
Security headers
30
Email security
80
DNS health
80
Network security
100
GDPR outside view
70
Average
72

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

Customer.io operates in the technology sector, focusing on marketing automation and customer engagement solutions. Its SaaS business model leverages AI and first-party data to deliver personalized messaging across email, push, SMS, and in-app channels. The company targets a broad range of customers, from small startups to large enterprises, emphasizing scalability and flexibility. Key competitive advantages include comprehensive data integrations, AI-powered content creation, and robust compliance certifications. The platform's ecosystem includes integrations with major ad networks and analytics tools, supporting a data-driven marketing approach. Growth indicators such as a large customer base and positive testimonials underscore market acceptance. The company maintains a consistent brand and professional content, reinforcing its position as a trusted technology provider.

Security posture

Customer.io demonstrates a mature security posture with adherence to multiple industry standards including ISO 27001, GDPR, HIPAA, SOC 2 Type II, and CCPA. The use of HTTPS and domain transfer protection enhances baseline security. However, the absence of DNSSEC and explicit security headers suggests areas for improvement. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. Incident response contact is available via a customer service email, though a dedicated security contact or vulnerability disclosure policy is not evident. Overall, the platform balances strong compliance with opportunities to enhance DNS security and transparency around vulnerability management.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS integrity and prevent spoofing.
  2. Publish a clear and accessible privacy policy and cookie consent mechanism to enhance GDPR and CCPA compliance.
  3. Develop and publicize a vulnerability disclosure policy or security.txt file to facilitate responsible security reporting.
  4. Implement and document security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options to strengthen web security.
  5. Enhance transparency by providing a dedicated security contact email and incident response procedures.

Contact details published on the site

Addresses
Legal name
Peaberry Software Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Peaberry Software Inc.
Description
Customer.io is a data-driven platform for personalized customer journeys across all channels, fueled by first-party data. It enables businesses to create automated, AI-powered customer engagement and messaging.
Key services
Customer journey automation, Data integrations and routing, AI-powered insights and content creation, Multi-channel messaging (email, push, SMS, in-app), Analytics and conversion tracking
Content quality
excellent
Branding
consistent

Technology

Stack
Next.js, React, AWS DNS hosting, Sentry (error tracking), Google Tag Manager
Frameworks
Next.js
Platforms
Vercel (implied by sentry environment), AWS (DNS)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Domain status clientTransferProhibited
  • ISO 27001 and SOC 2 Type II compliance
  • GDPR, HIPAA, CCPA compliance

Analytics and tracking

Services
Google Tag Manager, Sentry
Tracking level
moderate
Privacy practices
basic

Advertising

Transparency
basic

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 and no blocking detected.
  2. Strong emphasis on data-driven marketing automation with AI capabilities.
  3. Clear business and contact information present.
  4. Good use of modern web technologies and frameworks.
  5. Security certifications and compliance are prominently stated.
  6. No privacy or cookie policy pages detected in the provided content.
  7. No visible forms or data collection fields in the provided HTML snippet.
  8. Social media presence includes LinkedIn and Twitter.
  9. No explicit vulnerability disclosure or security.txt found.
Technical notes

Notes

The website is built using Next.js and React frameworks, indicating a modern and scalable front-end architecture. Hosting appears to be on Vercel with DNS managed by AWS Route 53, providing reliable infrastructure. The site uses Sentry for error tracking and Google Tag Manager for analytics, reflecting good operational monitoring. Performance is optimized with preloading of fonts and images, and responsive design ensures excellent mobile usability. No CMS is detected, suggesting a custom-built solution tailored to the company's needs. The technical stack supports fast loading times and good SEO practices, though enabling DNSSEC and adding security headers would further improve the technical security posture.
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. 72/100 −3Medium30 findingsView report
  2. 75/100 −2Medium29 findingsView report
  3. 77/100Low26 findingsView report
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