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Security report for flutter.dev

Google · Technology · United States

Medium risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

73/100

Risk levelMedium

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

Flutter.dev is the official website for Flutter, an open-source UI software development kit created and maintained by Google LLC. The platform enables developers to build natively compiled applications for mobile, web, desktop, and embedded devices from a single codebase. Positioned as a leading cross-platform development framework, Flutter targets developers and software engineers seeking efficient and productive app development tools. The website reflects Google's strong brand presence and commitment to developer experience, offering extensive documentation, community engagement, and integration with Google services.

Scanned

This is an earlier scan of flutter.dev. View the latest report

NIS2 and GDPR posture

GDPR outside view
68/ 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

4 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 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 flutter.dev

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.

Daily monitoring

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
77
Security headers
30
Email security
70
DNS health
90
Network security
100
GDPR outside view
68
Average
73

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

Flutter operates within the technology sector as an essential business entity under Google LLC. Its business model revolves around providing a free, open-source framework supported by a robust ecosystem including packages, plugins, and Google integrations. The platform benefits from Google's market position and extensive developer community, leveraging partnerships and integrations with services like Firebase, Google Ads, and Google Play. The website's content and structure indicate a mature product with a large user base and ongoing development, supported by Google's enterprise resources.

Security posture

The website demonstrates a strong security posture with HTTPS enforcement, modern security headers, and the use of reCAPTCHA to protect forms from abuse. Privacy and cookie policies are comprehensive and GDPR compliant, reflecting good data protection practices. However, explicit incident response contact information and a vulnerability disclosure policy are not present, representing areas for improvement. No vulnerabilities or exposed sensitive data were detected in the analysis. Overall, the security maturity is high, consistent with Google's standards.

Recommendations

  1. Publish explicit incident response and security contact information to improve transparency and readiness.
  2. Implement and publicize a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  3. Enhance user awareness of data retention policies and practices for analytics and user data.
  4. Continue maintaining and updating security headers and monitoring for third-party library vulnerabilities.
  5. Strengthen community engagement by providing clearer channels for security and privacy inquiries.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Google
Description
Flutter transforms the entire app development process. Build, test, and deploy beautiful mobile, web, desktop, and embedded apps from a single codebase.
Key services
Cross-platform app development, Developer tools and SDK, Integration with Google services, Community and ecosystem support
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, Alpine.js, Font Awesome, Google Fonts, Google Tag Manager, Google Analytics, reCAPTCHA v2
Frameworks
Alpine.js
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of reCAPTCHA for forms
  • Cookie consent mechanism
  • No exposed sensitive data in HTML
  • Use of security headers

Analytics and tracking

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

Advertising

Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed and maintained by Google.
  2. Content is comprehensive and targeted at developers.
  3. Strong integration with Google services and ecosystem.
  4. Good privacy and cookie policies with consent mechanisms.
  5. No direct contact emails or phone numbers found on the site.
  6. Security policies are present but incident response contacts are not explicit.
  7. No signs of suspicious or malicious content.
  8. Use of modern web technologies and analytics tools.
Technical notes

Notes

The website employs a modern and performant technology stack including HTML5, CSS3, JavaScript with Alpine.js, and Font Awesome icons. It leverages Google Fonts and is hosted on Google Cloud infrastructure, ensuring fast loading times and excellent mobile optimization. SEO and accessibility practices are well implemented, with proper meta tags and responsive design. Analytics and marketing tools such as Google Analytics and Tag Manager are used responsibly with cookie consent mechanisms. The site does not rely on a traditional CMS, indicating a custom or static site generation approach, which contributes to performance and security.
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. 76/100 +3Low26 findingsView report
  2. 73/100Medium24 findingsView report
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