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Security report for caniuse.com

Fyrd · Technology · N/a

High risk. 9 critical or high findings in Network security, Security headers and 2 other checks.

Security score

48/100

Risk levelHigh

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

Can I use is a well-established online resource providing comprehensive browser support tables for modern web technologies such as HTML5 and CSS3. Founded in 2010, it serves primarily web developers and front-end engineers by offering up-to-date compatibility data and integration tools. The site is recognized as an authoritative source in the web development community, supported by community contributions and partnerships such as with BrowserStack for live browser testing. The business model is primarily informational with revenue from advertising and optional Patreon support.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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

9 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: MySQL

      Port 3306 (MySQL) is publicly accessible - MySQL - Database server

      What to do: Immediately restrict access to MySQL 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. 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';…

  3. 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

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

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

Keep watching caniuse.com

This scan found 25 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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  • 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
62
Security headers
30
Email security
85
DNS health
75
Network security
0
GDPR outside view
35
Average
48

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

The website holds a strong market position as a trusted reference for browser compatibility, leveraging open source data and community input. Its partnership ecosystem includes BrowserStack, enhancing its service offering. The business targets technical professionals and developers globally, with a small but focused operational size. Revenue streams include advertising and patronage. The site maintains a consistent brand and high content quality, supporting its reputation and user trust.

Security posture

The site employs HTTPS and modern web technologies, ensuring secure data transmission. However, it lacks explicit security headers and publicly available security or incident response policies. No vulnerability disclosure or security.txt files are present, indicating room for improvement in transparency and security maturity. No exposed sensitive data or vulnerable libraries were detected, and the site follows good practices such as asynchronous script loading. Overall, the security posture is solid but could benefit from enhanced policy disclosures and DNSSEC implementation.

Recommendations

  1. Implement and publish a comprehensive privacy policy and cookie consent mechanism to improve privacy compliance.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance security posture.
  3. Publish a security policy and incident response plan, including a security.txt file for vulnerability disclosure.
  4. Enable DNSSEC on the domain to strengthen DNS security.
  5. Consider adding clear contact information for security and general inquiries to improve trust and communication.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Fyrd
Description
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
Key services
Browser support tables for web technologies, Feature comparison tools, Integration tools and third-party components, Partnership with BrowserStack for live browser testing
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Fonts (Inconsolata), Google Analytics, Google Adsense, BrowserStack integration, Custom CSS, HTML5
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced (implied by URL and scripts)
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected in scripts
  • Use of async and defer for scripts to improve performance

Analytics and tracking

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

Advertising

Ad networks
Google Adsense
Transparency
good

Site quality

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

Key observations

  1. Website is a well-established, authoritative resource for web technology compatibility data.
  2. No privacy or cookie policies explicitly found on the homepage HTML.
  3. No contact emails or phone numbers explicitly listed on the homepage.
  4. Strong use of community contributions and open source data.
  5. Advertising is present but unobtrusive and transparent.
  6. Good technical implementation with modern scripts and asynchronous loading.
  7. No explicit security policies or incident response information publicly available.
  8. No vulnerability disclosure or security.txt found.
  9. No personal or sensitive data collection forms detected on the homepage.
Technical notes

Notes

The website uses a modern tech stack including JavaScript, Google Fonts, Google Analytics, and Google Adsense, with asynchronous and deferred script loading for performance optimization. Hosting is provided by InMotion Hosting, indicated by nameservers. The site is mobile optimized and accessible, with good SEO practices evident in meta tags and structured navigation. No CMS was detected, suggesting a custom or static site architecture. Performance is fast, and the site integrates third-party tools effectively. Opportunities exist to improve security headers and formalize security policies.
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

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