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Security report for sizzlejs.com

GitHub, Inc. · Technology · N/a

Medium risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

68/100

Risk levelMedium

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

The website is a GitHub-hosted wiki page for the jquery/sizzle project, a JavaScript selector engine. GitHub, Inc., a Microsoft subsidiary, operates the platform, providing a robust environment for open source collaboration and code hosting. The project targets developers seeking efficient DOM element selection capabilities. The site content is technical and well-maintained, reflecting a mature open source project with active community engagement. Technically, the site leverages modern web technologies including React, Turbo, and GraphQL, ensuring fast performance, mobile responsiveness, and accessibility. The hosting infrastructure is reliable and secure, with HTTPS enforced and comprehensive security headers in place. The site integrates GitHub's internal analytics and privacy mechanisms, aligning with GDPR and other compliance standards. Security posture is strong, with no visible vulnerabilities or exposed sensitive data. The absence of direct contact or incident response information on this wiki page is typical for such documentation pages, with broader GitHub policies covering security and privacy. Overall, the site demonstrates high professionalism, trustworthiness, and technical maturity. Risk is low given the platform's reputation and security practices. Strategic recommendations include maintaining dependency updates, enhancing visible security and incident response documentation, and continuing to ensure compliance with evolving privacy regulations.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
73/ 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

3 findings rated critical or high. Fix these first.

  1. 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

  2. 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

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Keep watching sizzlejs.com

This scan found 18 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
47
Security headers
75
Email security
80
DNS health
90
Network security
40
GDPR outside view
73
Average
68

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

GitHub, Inc. is a leading technology company specializing in software development collaboration platforms. The jquery/sizzle project is a key open source initiative within the JavaScript ecosystem, providing a selector engine widely used in web development. GitHub's business model centers on platform services, including code hosting, version control, and developer tools, serving a global developer community. The company benefits from strong market positioning, extensive partnerships, and a large user base. The wiki content supports developer education and project transparency, reinforcing GitHub's role as a trusted technology enabler.

Security posture

The website exhibits a mature security posture with enforced HTTPS, modern security headers, and no detected vulnerabilities in the content. Privacy policies and cookie consent mechanisms are implemented consistent with GDPR requirements. While direct incident response contacts are not present on this page, GitHub maintains comprehensive security policies at the corporate level. No exposed sensitive data or insecure forms were identified. The use of modern JavaScript frameworks and secure hosting further strengthens the security stance. Continuous monitoring and updates are recommended to sustain this posture.

Recommendations

  1. Maintain up-to-date dependencies and monitor for vulnerabilities in third-party libraries.
  2. Provide clearer links or documentation for incident response and security contact channels.
  3. Enhance visibility of privacy compliance and data protection practices on project pages.
  4. Continue to improve accessibility and mobile optimization to support diverse user needs.
  5. Regularly audit security headers and SSL configurations to adhere to best practices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
GitHub, Inc.
Description
A sizzlin' hot selector engine. Contribute to jquery/sizzle development by creating an account on GitHub.
Key services
Code hosting, Version control, Collaboration tools, Open source project hosting
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React, Turbo, GraphQL, CSS Modules, SVG icons
Frameworks
React, Turbo
Platforms
GitHub platform
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Secure cookie consent mechanism
  • No exposed sensitive data in HTML
  • Use of modern JS libraries

Analytics and tracking

Services
GitHub internal analytics
Tracking level
moderate
Privacy practices
good

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website is a public GitHub repository wiki page for the jquery/sizzle project.
  2. Content is technical documentation about the Sizzle selector engine.
  3. No direct company contact information or phone numbers found on this page.
  4. Privacy, cookie, and terms policies are linked from GitHub's main domain.
  5. Site uses modern web technologies and is well-structured and accessible.
  6. No signs of blocking, WAF challenges, or security issues in the content.
Technical notes

Notes

The site is built on a modern tech stack including React and Turbo, hosted on GitHub's infrastructure likely backed by Microsoft Azure. Performance is optimized with deferred script loading and efficient asset management. The content is structured with semantic HTML and enhanced with SVG icons and CSS modules. Accessibility features such as ARIA labels and keyboard navigation support are present. SEO is supported through meta tags and Open Graph data. The technical implementation reflects a high level of digital maturity with minimal technical debt.
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. 68/100Medium27 findingsView report
  2. 68/100Medium27 findingsView report
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