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Security report for guamtax.com

Guam Department of Revenue and Taxation · Government · Guam

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

Security score

66/100

Risk levelMedium

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

GuamTax.com serves as the official online portal for the Guam Department of Revenue and Taxation, providing a comprehensive suite of tax-related services including business and individual e-filing, online payments, public notices, and regulatory information. The site targets residents and businesses in Guam, positioning itself as the authoritative government resource for tax compliance and revenue collection. Key services include business privilege tax returns, real property tax inquiries, vehicle registration, and passport office information. Technically, the website employs standard web technologies such as JavaScript, Google Tag Manager for analytics, and Google Fonts for typography. The site demonstrates moderate performance and basic mobile optimization, with a structured navigation system and consistent branding. However, there is room for improvement in accessibility and SEO optimization. The absence of a detected CMS or hosting provider details suggests a custom or government-managed infrastructure. From a security perspective, the site uses HTTPS and secure login forms but lacks visible security headers such as Content-Security-Policy or Strict-Transport-Security in the provided data. No critical vulnerabilities or exposed sensitive data were detected. Privacy compliance is basic, with a privacy policy present but no cookie consent mechanism or GDPR indicators. The WHOIS data is notably missing, raising concerns about domain registration legitimacy, although the official government branding and content strongly indicate authenticity. Overall, GuamTax.com is a functional and trustworthy government website with solid content and service offerings. Strategic improvements in security headers, privacy compliance, and WHOIS transparency would enhance trust and security posture, supporting the site's critical role in Guam's tax administration.

Scanned

NIS2 and GDPR posture

GDPR outside view
58/ 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 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 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 guamtax.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
85
Security headers
15
Email security
60
DNS health
75
Network security
100
GDPR outside view
58
Average
66

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

GuamTax.com operates as a government service portal, delivering essential tax and revenue services to Guam's residents and businesses. Its market position as the official tax authority website provides a competitive advantage in trust and authority. The business model focuses on regulatory compliance facilitation, e-filing, and payment processing, with revenue streams likely derived from government funding rather than commercial sales. The target customer segments include individual taxpayers, business entities, and regulatory bodies. Growth indicators include ongoing updates to tax forms, public notices, and expanded online services. The partnership ecosystem includes related government domains handling payments and individual services, reflecting a cohesive government digital infrastructure. Operationally, the site supports transparency and accessibility of tax information, contributing to effective tax administration in Guam.

Security posture

The security maturity level of GuamTax.com is moderate. The site enforces HTTPS and secure login mechanisms, which are fundamental for protecting user data. However, the lack of visible security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security reduces defense-in-depth capabilities. No exposed sensitive data or vulnerable libraries were identified, indicating good baseline hygiene. The absence of explicit incident response contacts or security policies suggests limited public-facing security governance documentation. Privacy compliance is minimal, with no cookie consent or GDPR compliance indicators, which could pose regulatory risks. Overall, while the site is functional and secure for general use, enhancing security headers, privacy mechanisms, and incident response transparency would significantly improve its security posture.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, X-XSS-Protection, and Strict-Transport-Security to strengthen browser security.
  2. Introduce a cookie consent banner and update privacy policies to reflect GDPR and other relevant privacy regulations to improve compliance.
  3. Investigate and resolve the missing WHOIS data issue to ensure domain registration transparency and trustworthiness.
  4. Enhance mobile responsiveness and accessibility features to improve user experience across devices and for users with disabilities.
  5. Publish clear security policies and incident response contacts to improve transparency and readiness for security incidents.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Guam Department of Revenue and Taxation
Description
Official website providing tax-related services, information, and resources for Guam residents and businesses, including e-filing, payments, public notices, and regulatory information.
Key services
Business and individual tax e-filing, Online payments, Public notices and updates, Vehicle registration and inspection services, Real estate licensing and directories, Passport office information
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, Google Tag Manager, HTML5, CSS3, Google Fonts
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
basic

Security

Observed score
65/100
Good practices seen
  • Use of HTTPS (implied by URL)
  • Secure login form with POST method
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Tag Manager
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. Official government tax and revenue website for Guam
  2. Comprehensive tax-related services and information provided
  3. No WHOIS data available, raising domain legitimacy questions
  4. No privacy or cookie consent banners detected
  5. Secure login forms present for business users
  6. Use of Google Tag Manager for analytics
  7. No evident security headers in provided data
  8. No adult or explicit content detected
  9. Mobile optimization is basic but functional
  10. No visible terms of service or security policy pages
Technical notes

Notes

The website is built using standard web technologies including HTML, CSS, and JavaScript, with Google Tag Manager integrated for analytics. The use of Google Fonts enhances typography. The site lacks a detectable CMS, suggesting a custom or government-managed platform. Performance is moderate with basic mobile optimization and accessibility. Navigation is clear and consistent, supporting good user experience. However, the absence of modern security headers and cookie consent mechanisms indicates technical debt in security and privacy compliance. There is an opportunity to modernize the tech stack by adopting security best practices, improving SEO, and enhancing mobile and accessibility standards to reduce operational risks and improve service delivery.
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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