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Security report for timothygu.me

Tiancheng "Timothy" Gu · Technology · N/a

Medium risk. 11 critical or high findings in Email security, Security headers and 3 other checks.

Security score

50/100

Risk levelMedium

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

The website timothygu.me is a personal site serving as a hub for Timothy Gu's blog posts, programming projects, and personal content. It targets a general audience interested in technology and programming. The site is small-scale, with content dating back to 2014-2015, consistent with the domain registration date in 2015. The business model is personal branding and content sharing without commercial transactions. Technically, the site uses a static site generator (likely Jekyll), hosted on GitHub Pages with DNS managed via Cloudflare. It employs modern web technologies including Google Fonts, Font Awesome, and Google Analytics for tracking. The site is mobile optimized and performs well with good SEO practices. Security posture is adequate with HTTPS enforced but lacks advanced security headers and DNSSEC. Privacy compliance is weak due to absence of privacy and cookie policies. No contact emails or phone numbers are publicly listed, only a contact form is available. The domain is privacy protected, which is justified for a personal site, and shows no suspicious patterns. Overall, the site is trustworthy but could improve privacy and security practices.

Scanned

This is an earlier scan of timothygu.me. View the latest report

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

11 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 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';…

  3. 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

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

Keep watching timothygu.me

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

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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
62
Security headers
15
Email security
40
DNS health
50
Network security
100
GDPR outside view
35
Average
50

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

Timothy Gu's website positions itself as a personal technology blog and portfolio, targeting tech enthusiasts and peers. The site leverages open source and social coding platforms like GitHub and Bitbucket, indicating a developer audience. Revenue streams or monetization are not evident, suggesting a non-commercial focus. The presence of social media links supports community engagement. The site’s longevity since 2015 indicates stable content presence. No partnerships or subsidiaries are identified. The site’s ecosystem is simple, focusing on content delivery and personal branding.

Security posture

The website enforces HTTPS and uses reputable hosting and DNS providers, which is positive. However, the lack of DNSSEC and security headers such as Content-Security-Policy and X-Frame-Options reduces its defense-in-depth. No vulnerability disclosure or incident response information is provided, which limits transparency. Google Analytics tracking is present without visible cookie consent mechanisms, raising privacy compliance concerns. No exposed sensitive data or vulnerable libraries were detected. Overall, security maturity is moderate but could be enhanced by implementing recommended headers, privacy policies, and vulnerability disclosure mechanisms.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Add comprehensive privacy and cookie policies to comply with GDPR and inform users.
  3. Implement security headers such as Content-Security-Policy, X-Content-Type-Options, and X-Frame-Options.
  4. Create and publish a security.txt file to facilitate vulnerability reporting.
  5. Consider adding explicit contact emails for security or general inquiries to improve trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Tiancheng "Timothy" Gu
Description
Personal website and blog serving as a hub for all things related to Timothy Gu, including blog posts about programming, personal experiences, and projects.
Key services
Blog posts, Personal portfolio, Contact for inquiries
Content quality
good
Branding
consistent

Technology

Stack
HTML5, CSS3, Google Fonts, Font Awesome 4.2.0, Google Analytics, Google Tag Manager
Frameworks
Jekyll (implied by theme reference)
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced (implied by https URLs)
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

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

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Personal website with blog and portfolio content
  2. No privacy or cookie policies present
  3. No explicit contact emails or phone numbers found
  4. Social media presence on GitHub, Bitbucket, Twitter, Instagram
  5. Uses Google Analytics and Tag Manager for tracking
  6. No security.txt or vulnerability disclosure found
  7. No security headers detected in provided data
  8. Domain uses Cloudflare DNS but DNSSEC not enabled
Technical notes

Notes

The website is built using a static site generator, likely Jekyll, hosted on GitHub Pages with DNS managed by Cloudflare. It uses modern web fonts and icon libraries, and integrates Google Analytics and Tag Manager for user tracking. The site is mobile responsive and well-structured with proper meta tags for SEO. Performance is fast due to static hosting. However, no CMS or dynamic backend is detected, limiting interactive capabilities. The absence of security headers and DNSSEC are technical gaps. Overall, the technical infrastructure is modern and efficient for a personal site but could benefit from enhanced security configurations.
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. 50/100Medium39 findingsView report
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