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Security report for zlketang.com

之了课堂 · Education · China

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

62/100

Risk levelMedium

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

之了课堂 is a Chinese online education platform specializing in accounting professional training, offering courses such as junior and intermediate accounting certifications, CPA, tax advisor, and CMA exam preparation. The website presents itself as a professional and focused training provider in the accounting education sector, targeting students and professionals seeking certification and practical skills. Technically, the site uses modern web technologies including Vue.js and integrates Baidu Analytics for user tracking. The site is moderately optimized for performance and mobile devices, with good SEO practices but basic accessibility features. Security-wise, the site uses HTTPS and has implemented client-side error reporting with rate limiting, but lacks visible security headers and explicit privacy or cookie policies, which are important for compliance and user trust. The absence of WHOIS data for the domain raises concerns about registration transparency, although the website content appears legitimate and professional. Overall, the site is functional and relevant for its target audience but would benefit from enhanced privacy compliance and security best practices.

Scanned

NIS2 and GDPR posture

GDPR outside view
50/ 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

7 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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 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

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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
67
Security headers
15
Email security
70
DNS health
70
Network security
100
GDPR outside view
50
Average
62

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

The platform operates in the education sector, specifically focusing on accounting professional training in China. It offers a range of certification preparation courses, positioning itself as a specialized niche provider. The business model is primarily online course delivery, targeting accounting students and professionals. The use of Baidu Analytics indicates a focus on the Chinese market. The lack of visible contact information and privacy policies may impact user trust and regulatory compliance. No evident partnerships or subsidiaries were identified from the website content. The platform appears to be medium-sized with consistent branding and good content quality, aiming to capture a segment of the professional education market in China.

Security posture

The website employs HTTPS, ensuring encrypted communication. It has implemented client-side error reporting with rate limiting to avoid flooding the server with error logs. However, it lacks important security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options, which are recommended to mitigate common web vulnerabilities. No explicit privacy or cookie policies were found, which is a compliance gap especially under GDPR and similar regulations. No contact channels for security incidents or vulnerability disclosures are provided. The absence of WHOIS data reduces transparency and trust. Overall, the security posture is moderate but requires improvements in headers, privacy compliance, and incident response readiness.

Recommendations

  1. Implement and publish comprehensive privacy and cookie policies with user consent mechanisms to comply with data protection regulations.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to enhance protection against common web attacks.
  3. Provide clear contact information including security incident response contacts to improve trust and readiness.
  4. Improve mobile optimization and accessibility to enhance user experience across devices and for users with disabilities.
  5. Investigate and clarify domain WHOIS information to improve transparency and legitimacy perception.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
之了课堂
Description
之了课堂是专注于会计职业教育培训的会计网校，提供初级会计职称、中级会计职称、注册会计师、税务师、中级经济师、CMA考试、会计实操等培训服务，学会计就上之了课堂。
Key services
初级会计职称培训, 中级会计职称培训, 注册会计师培训, 税务师培训, 中级经济师培训, CMA考试培训, 会计实操培训
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, CSS, HTML5
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
good

Security

Observed score
60/100
Good practices seen
  • Error reporting with rate limiting
  • Use of HTTPS (implied by canonical URL https://)

Analytics and tracking

Services
Baidu Analytics
Tracking level
moderate
Privacy practices
poor

Advertising

Tracking pixels
Baidu Analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is a professional Chinese accounting education platform
  2. No WHOIS data available, domain may be privacy protected or unregistered
  3. No explicit privacy, cookie, or terms of service pages found
  4. No direct contact emails or phone numbers found in content
  5. Uses Baidu Analytics for tracking
  6. No WAF or blocking detected
  7. Good SEO and content quality
  8. Basic mobile optimization and accessibility
Technical notes

Notes

The website uses modern front-end technologies, likely Vue.js, with multiple CSS files and JavaScript for dynamic content and error reporting. It integrates Baidu Analytics for tracking user behavior. The site is served over HTTPS with canonical URLs properly set. Performance is moderate with some optimization potential. Accessibility features are basic, with some use of ARIA attributes implied but not fully evident. SEO is good with meta keywords and descriptions present. Hosting provider details are not explicitly found. No CMS is detected from the source. Error reporting includes rate limiting and filtering of invalid errors, indicating attention to client-side stability.
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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