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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 operator in Brazil, offering a comprehensive suite of financial market services including trading, clearing, and settlement. The website serves a broad audience ranging from individual investors to large financial institutions, providing access to market data, investment products, and educational resources. The company holds a leading market position in Latin America and operates with a strong brand presence and professional digital infrastructure. Technically, the website is built on modern web technologies including Angular and leverages Cloudflare for DNS and CDN services, ensuring good performance and security. The site incorporates multiple analytics and tracking tools with appropriate privacy and cookie consent mechanisms, reflecting a mature digital compliance posture. Security-wise, the site enforces HTTPS, employs security headers, and maintains ISO 27001 certification, indicating a robust security framework. However, explicit security policies and incident response contacts could be more visible. Overall, the website is professional, trustworthy, and well-aligned with the company's business stature.

Scanned

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 21 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 critical financial market infrastructure provider in Brazil, facilitating stock and derivatives trading for a diverse client base. Its business model centers on transaction fees, market data sales, and ancillary financial services. The company benefits from a strong regulatory environment and a dominant market position, which supports stable revenue streams. The website reflects this by targeting investors and market participants with clear service offerings and educational content. The presence of certifications and compliance statements enhances credibility. The company appears to invest in digital maturity, leveraging analytics and user experience improvements to maintain competitive advantage. Partnerships and integrations with global platforms like YouTube and Google Tag Manager indicate an active marketing and communication strategy.

Security posture

The website demonstrates a high level of security maturity with enforced HTTPS, comprehensive security headers, and ISO 27001 certification. The use of Cloudflare DNS and CDN adds a layer of protection and performance optimization. Privacy compliance is evident through cookie consent banners and detailed privacy policies. No exposed sensitive data or vulnerable libraries were detected in the HTML content. However, the absence of a publicly accessible security policy or vulnerability disclosure program limits transparency in incident response readiness. The site would benefit from publishing explicit security contact channels and a security.txt file to facilitate responsible vulnerability reporting. Overall, the security posture is strong but could be enhanced with improved communication of security governance.

Recommendations

  1. Publish a dedicated security policy page outlining security governance and controls.
  2. Provide clear incident response contact information, including abuse and security email addresses.
  3. Implement and publish a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  4. Regularly review and audit third-party scripts and analytics tools for security and privacy compliance.
  5. Enhance transparency around data retention policies and user privacy rights.

Contact details published on the site

Addresses
Legal name
B3 S.A. - Brasil, Bolsa, Balcão
Registration number
Company registration 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 wide range of financial products and services.
Key services
Stock trading, Derivatives trading, Clearing and settlement, Market data services, Investment products
Content quality
good
Branding
consistent

Technology

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

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • Cookie consent implemented
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

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

Advertising

Tracking pixels
Google Analytics (via GTM), Microsoft Clarity, Maze
Marketing tools
Maze
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed and maintained by a major Brazilian financial institution.
  2. Strong privacy and cookie compliance with visible consent mechanisms.
  3. Use of modern analytics and tracking tools with privacy considerations.
  4. No signs of malicious or suspicious content.
  5. Good mobile and accessibility support.
  6. WHOIS data supports legitimacy and trustworthiness.
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 integrates multiple analytics platforms including Google Analytics, Microsoft Clarity, and Maze, supporting data-driven decision making. Performance is moderate with good mobile optimization and accessibility features implemented. SEO practices are adequate with proper meta tags and structured data. The site does not appear to use a common CMS, suggesting a custom or proprietary content management solution. Technical risks are minimal, but continuous monitoring of third-party dependencies is recommended to mitigate supply chain risks.
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. 71/100Medium28 findingsView report
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