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Security report for b3.com.br

B3 S.A. - Brasil, Bolsa, Balcão · Finance · Brazil

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

Security score

71/100

Risk levelMedium

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

B3 S.A. is the primary stock exchange and financial market infrastructure operator in Brazil, providing a comprehensive suite of services including trading, clearing, settlement, and market data. The company targets a broad audience including investors, financial institutions, and corporations, positioning itself as a critical player in the Brazilian financial ecosystem. The website reflects a mature digital presence with a modern Angular-based frontend, hosted behind Cloudflare, and integrates multiple analytics and tracking tools for performance and user behavior insights. Security posture is strong with HTTPS enforcement, security headers, and no visible vulnerabilities, although explicit security and incident response policies are not prominently published. Privacy and cookie policies are present and include consent mechanisms, indicating compliance with GDPR and local regulations. WHOIS data confirms the domain's legitimacy and consistency with the business entity. Overall, the website is professional, trustworthy, and well-optimized for mobile and accessibility standards.

Scanned

This is an earlier scan of b3.com.br. View the latest report

NIS2 and GDPR posture

GDPR outside view
65/ 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 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 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

    • High

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, Twitter, LinkedIn, YouTube

      What to do: Document all third-party data sharing in your privacy policy

  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
    • 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 b3.com.br

This scan found 20 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.

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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
47
Security headers
60
Email security
85
DNS health
70
Network security
100
GDPR outside view
65
Average
71

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

B3 operates as a financial market infrastructure provider with a business model centered on transaction fees, data services, and market facilitation. It holds a dominant market position in Brazil's capital markets and energy and transportation sectors. The company leverages partnerships and maintains a strong brand presence. Its digital strategy includes comprehensive content, educational resources, and investor engagement. The absence of a public vulnerability disclosure program suggests an area for improvement in transparency. The company’s size and enterprise status are reflected in the website's scale and content depth.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, robust security headers, and no evident exposure of sensitive data. The use of Cloudflare DNS and CDN adds a layer of protection against common web threats. However, the lack of a dedicated security policy page and incident response contact details limits transparency. No security.txt or vulnerability disclosure policy was found, which could enhance trust and facilitate responsible vulnerability reporting. The integration of third-party analytics is done with consent mechanisms, aligning with privacy best practices. Overall, the security posture is strong but could benefit from improved communication of security policies.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement and publicly disclose a vulnerability disclosure policy and security.txt file.
  3. Regularly review and audit third-party scripts and analytics tools for security risks.
  4. Enhance user trust by providing clear contact channels for security incidents and data protection inquiries.
  5. Continue to optimize website performance and accessibility to maintain high user experience standards.

Contact details published on the site

Addresses
Legal name
B3 S.A. - Brasil, Bolsa, Balcão
Registration number
Company registration number not explicitly found in HTML
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
B3 S.A. - Brasil, Bolsa, Balcão
Description
B3 is the main stock exchange in Brazil, providing trading, clearing, and settlement services for financial assets. It serves investors, companies, and market participants with a broad portfolio of products and services.
Key services
Stock trading, Derivatives trading, Clearing and settlement, Market data services, Investment education
Content quality
good
Branding
consistent

Technology

Stack
Angular (indicated by _ngcontent attributes), Cloudflare DNS and CDN, Google Tag Manager, Microsoft Clarity, YouTube iframe API, Maze analytics
Frameworks
Angular
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No exposed sensitive data in HTML
  • Use of modern JavaScript libraries

Analytics and tracking

Services
Google Analytics, Microsoft Clarity, Maze
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Microsoft Clarity, Google Analytics via GTM
Marketing tools
Maze analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and well-structured
  2. Strong focus on financial market services in Brazil
  3. Good privacy and cookie compliance with consent mechanisms
  4. Use of modern analytics and tracking tools with transparency
  5. No signs of malicious or suspicious activity
  6. No explicit security policy or incident response page found
  7. WHOIS data supports legitimacy and business continuity
Technical notes

Notes

The website is built using Angular framework, indicating a modern single-page application architecture. Hosting and DNS are managed via Cloudflare, providing CDN and security benefits. The site uses Google Tag Manager, Microsoft Clarity, and Maze for analytics and user behavior tracking, integrated with cookie consent mechanisms. The design is responsive and optimized for mobile devices, with good accessibility features. Performance is moderate, with potential for further optimization. No CMS detected, suggesting a custom or proprietary platform. Security headers and HTTPS configuration are well implemented, contributing to a secure browsing experience.
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. 71/100Medium29 findingsView report
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