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Security report for 51offer.com

Education · China

Medium risk. 7 critical or high findings in Security headers and GDPR outside view.

Security score

63/100

Risk levelMedium

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

51offer.com is a well-established Chinese education platform specializing in study abroad services for countries including the UK, USA, Australia, New Zealand, Japan, Singapore, and Hong Kong. The platform offers a comprehensive suite of services such as free application assistance, professional consulting, visa processing, and educational content including guides and DIY tools. The business targets Chinese students and families seeking overseas education opportunities and maintains a medium-sized market presence with multiple offline centers across China. Technically, the website employs modern JavaScript frameworks like Vue.js and uses HTTPS for secure communications, though some legacy libraries like an older jQuery version are still in use. Security posture is moderate with room for improvement in security headers and DNSSEC implementation. Privacy compliance is weak due to the absence of explicit privacy and cookie policies or consent mechanisms. Overall, the site is professional, content-rich, and trustworthy but would benefit from enhanced security and privacy practices.

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

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

Keep watching 51offer.com

This scan found 23 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
90
Security headers
15
Email security
70
DNS health
70
Network security
100
GDPR outside view
35
Average
63

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 company operates in the education sector, focusing on study abroad consulting and application services. It leverages a hybrid business model combining free application services with paid consulting and visa assistance. The platform has a strong foothold in the Chinese market with a decade-plus operational history, supported by multiple physical offices and a large user base. Strategic partnerships and sister domains support account management, events, and specialized services like art portfolios. The company’s competitive advantage lies in its comprehensive service offering, localized content, and offline presence. Growth indicators include active content updates, user engagement features, and integration of multiple countries and educational systems.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enabled and domain transfer protection in place. However, the lack of DNSSEC and absence of key security headers such as Content-Security-Policy and X-Frame-Options reduce its defense-in-depth. The use of an outdated jQuery version may expose the site to known vulnerabilities. No published security policies or incident response contacts were found, indicating potential gaps in compliance and readiness. Data exposure risks appear low based on the content analysis, but improvements in security best practices and transparency are recommended to enhance trust and resilience.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement and publish a comprehensive privacy policy and cookie consent mechanism to comply with GDPR and other privacy regulations.
  3. Upgrade JavaScript libraries, especially jQuery, to the latest secure versions to mitigate known vulnerabilities.
  4. Add essential security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection to harden the website against common attacks.
  5. Develop and publish an incident response policy including dedicated security contact channels to improve transparency and preparedness.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
51offer为一站式留学服务智能平台,拥有十年出国留学操作经验.51offer让留学更简单提供英国、美国以及澳洲等众多国家大学的免费留学申请,出国留学指南,DIY留学全攻略等.
Key services
Free study abroad application, Professional 1-on-1 consulting, Visa processing, Study guides and strategies, DIY application tools, Offline study centers
Content quality
good
Branding
consistent

Technology

Stack
Vue.js 2.5.3, jQuery 1.8.3, Sea.js 2.3.0, Handlebars.js, BadJS (error reporting)
Frameworks
Vue.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
65/100
Good practices seen
  • HTTPS enabled
  • ClientTransferProhibited domain status
  • No DNSSEC (not enabled)
  • No exposed sensitive data found in HTML
  • Use of error reporting scripts (BadJS)

Analytics and tracking

Services
Baidu Analytics, Google Analytics
Tracking level
moderate
Privacy practices
poor

Advertising

Tracking pixels
Baidu Analytics (hm.baidu.com), Google Analytics (google-analytics.com)
Marketing tools
Baidu linksubmit
Transparency
basic

Site quality

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

Key observations

  1. Website is a mature, established education platform focused on study abroad services.
  2. Content is primarily in Chinese targeting Chinese students interested in overseas education.
  3. Multiple offline centers with physical addresses and phone numbers indicate real-world presence.
  4. No privacy or cookie policies explicitly found on main page content.
  5. Use of older JavaScript libraries may pose security risks.
  6. No explicit security or incident response policies published.
  7. Good use of HTTPS and domain transfer protection.
  8. Moderate use of tracking and analytics tools without visible consent mechanisms.
Technical notes

Notes

The website uses a modern front-end stack centered on Vue.js 2.5.3 and Sea.js for module loading, combined with legacy jQuery 1.8.3. It employs asynchronous loading of analytics and tracking scripts from Baidu and Google Analytics. The site is hosted under a domain registered with Network Solutions, LLC, with DNS services provided by dnspod.net. Performance is moderate with good mobile optimization and SEO practices evident from meta tags and structured navigation. Accessibility features are basic but present. The site lacks a CMS indication and uses custom modular JavaScript components. Technical debt is noted in the use of outdated libraries and missing security headers, which should be addressed to reduce risk and improve maintainability.
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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