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Security report for jsdmirror.com

JSDMirror · Technology · China

Medium risk. 6 critical or high findings in Email security, Security headers and 1 other check.

Security score

57/100

Risk levelMedium

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

JSDMirror is a small technology-focused entity providing free CDN acceleration services optimized for frontend static resources, primarily targeting developers and open-source projects compliant with Chinese mainland laws. The service leverages multiple CDN providers and Tencent Cloud infrastructure to deliver global acceleration with a focus on stability and compliance. The website is professionally designed with clear navigation and multilingual support, emphasizing transparency through team introductions and partner listings. Technically, it employs modern frontend libraries such as Bootstrap and Typed.js, hosted on Tencent Cloud with multiple CDN integrations, ensuring fast performance and good mobile optimization. Security posture is moderate, with HTTPS enforced and some content security measures like SRI recommended, but lacks explicit security headers and cookie consent mechanisms. WHOIS data is unavailable, which reduces trustworthiness despite the website's legitimate appearance and compliance indicators. Overall, the site presents a reliable free CDN service with room for improvement in security and privacy compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

6 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  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 Cookie Policy found

      GDPR requires clear information about cookie usage

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

    • 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

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

Keep watching jsdmirror.com

This scan found 30 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

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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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
85
Security headers
25
Email security
30
DNS health
50
Network security
100
GDPR outside view
53
Average
57

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

JSDMirror occupies a niche in the CDN acceleration market by offering free, compliant services tailored for Chinese developers and open-source projects. Its competitive advantage lies in multi-CDN integration, Tencent Cloud backing, and compatibility with jsDelivr acceleration methods. Revenue appears to be supported by sponsorships and donations rather than direct sales. The partnership ecosystem includes major CDN providers and cloud platforms, enhancing service reliability. The business model focuses on community and open-source engagement, with clear communication channels and team transparency. Growth potential depends on maintaining compliance and expanding partner networks. Strategic observations include the need to enhance privacy and security policies to align with global standards and improve trust.

Security posture

The security maturity of JSDMirror is moderate. HTTPS is enforced, and the site promotes security best practices such as Subresource Integrity (SRI) usage. However, the absence of explicit security headers (CSP, HSTS, X-Frame-Options) and lack of a cookie consent mechanism indicate gaps in security hardening and privacy compliance. No vulnerability disclosure or incident response policies are published, which could hinder timely handling of security incidents. The missing WHOIS data raises concerns about domain transparency. Overall, while no critical vulnerabilities are evident, the site would benefit from formalizing security policies, improving header configurations, and enhancing privacy controls to meet higher compliance standards.

Recommendations

  1. Implement and publish comprehensive security headers including CSP, HSTS, and X-Frame-Options to mitigate common web attacks.
  2. Add a cookie policy and consent mechanism to comply with privacy regulations and improve user trust.
  3. Publish a vulnerability disclosure and incident response policy to enhance security readiness and transparency.
  4. Improve accessibility features to broaden user inclusivity and meet web standards.
  5. Investigate and resolve WHOIS data availability to improve domain registration transparency and trustworthiness.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
JSDMirror
Description
JSDMirror 是基于多级缓存与边缘计算的免费开源加速服务，采用腾讯云 COS 持久化存储及 TKE 弹性计算集群，通过智能调度多 CDN 供应商实现全球加速，面向符合中国大陆法律法规的项目免费提供CDN加速。
Key services
全球CDN加速, 多容灾项目, 统一加速方法兼容jsdelivr, API支持自定义域名、缓存管理和资源预热
Content quality
good
Branding
consistent

Technology

Stack
Bootstrap Icons, Typed.js, jQuery 3.6.0 slim, Popper.js, Tencent Cloud COS, TKE (Tencent Kubernetes Engine)
Frameworks
Bootstrap
Platforms
Tencent Cloud
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced (implied by cdn.jsdmirror.com usage)
  • Content Security via SRI announcement
  • Image content review via Tencent Cloud 万象 CI

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with rich content and no blocking.
  2. Content is primarily in Chinese with some English translations.
  3. Focus on free CDN acceleration services compliant with Chinese laws.
  4. Multiple partner CDN providers and sponsors listed.
  5. Clear contact emails provided in footer.
  6. No phone numbers or physical addresses found.
  7. No cookie consent mechanism detected.
  8. No explicit security headers detected in provided data.
  9. No forms detected in the HTML content.
  10. No JSON-LD or Open Graph metadata found.
Technical notes

Notes

The website is built on a modern technology stack including Bootstrap for responsive design, Typed.js for dynamic text effects, and jQuery for DOM manipulation. Hosting is provided by Tencent Cloud leveraging COS for storage and TKE for container orchestration, ensuring scalable and reliable infrastructure. Multiple CDN providers are integrated for global content delivery and redundancy. Performance is optimized with fast loading times and mobile responsiveness. However, the site lacks advanced SEO metadata such as Open Graph or JSON-LD structured data, which could improve search engine visibility. No CMS is detected, indicating a custom or static site architecture. Technical risks include potential dependency on third-party CDN availability and the absence of explicit security headers.
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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