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Security report for myguamtax.com

Guam Department of Revenue and Taxation · Government · Guam

Medium risk. 7 critical or high findings in Email security, Security headers and 2 other checks.

Security score

63/100

Risk levelMedium

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

MyGuamTax.com serves as the official online portal for the Guam Department of Revenue and Taxation, providing essential tax filing, payment, vehicle registration, and passport-related services to residents and businesses in Guam. The website is positioned as the primary government platform for these services, offering a range of e-filing and payment options tailored to individuals and businesses. The portal integrates with related Guam government services and payment gateways, reinforcing its role as a centralized tax and revenue service hub. From a technical perspective, the website employs standard web technologies including JavaScript, CSS, and Google Tag Manager for analytics. While the site is functional and moderately optimized for mobile devices, there is room for improvement in accessibility and SEO. The absence of a CMS or advanced frameworks suggests a relatively straightforward technical infrastructure. Performance is moderate, with no critical errors detected. Security-wise, the site benefits from HTTPS encryption and secure login forms, but lacks visible security headers such as Content-Security-Policy and HSTS, which are recommended for enhanced protection. The absence of published security policies or incident response information indicates a gap in transparency and preparedness. Additionally, no cookie consent mechanism is present, which may impact privacy compliance. Overall, the website is trustworthy and professional, reflecting its government affiliation. However, the missing WHOIS data for the domain is a notable anomaly that reduces the trust score. Strategic improvements in security headers, privacy compliance, and technical modernization would strengthen the site's security posture and user trust.

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

7 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 myguamtax.com

This scan found 25 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
67
Security headers
15
Email security
60
DNS health
75
Network security
100
GDPR outside view
58
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 Guam Department of Revenue and Taxation operates MyGuamTax.com as a government service portal focused on tax collection, vehicle registration, and passport services. The site targets Guam residents and businesses, offering e-filing and online payment capabilities that streamline government interactions. The business model is service-oriented, funded by government budgets rather than commercial revenue streams. The portal's integration with related government domains and payment processors indicates a well-established partnership ecosystem. Growth indicators include recent updates to public notices and directories, reflecting active maintenance. Competitive advantage lies in its official status and comprehensive service offerings. The absence of social media presence suggests a focus on direct government communication channels.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and secure login forms. However, the lack of security headers such as CSP, HSTS, and X-Frame-Options exposes potential risks to clickjacking, content injection, and downgrade attacks. No evidence of vulnerable libraries or exposed sensitive data was found, but the absence of published security policies and incident response contacts limits transparency and preparedness. Privacy compliance is partial, with a privacy policy present but no cookie consent mechanism. The use of Google Tag Manager introduces moderate user tracking, which should be balanced with privacy considerations. Overall, the security posture is adequate for a government portal but requires enhancements to meet best practices and regulatory standards.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options to mitigate common web vulnerabilities.
  2. Introduce a cookie consent banner and update privacy policies to reflect GDPR and other privacy regulations compliance.
  3. Publish a clear security policy and incident response contact information to improve transparency and user trust.
  4. Enhance mobile responsiveness and accessibility features to improve user experience across devices and for users with disabilities.
  5. Conduct regular security audits and update third-party scripts to minimize vulnerabilities and ensure compliance.

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 online portal for Guam Department of Revenue and Taxation providing tax filing, payment, vehicle registration, and passport services to individuals and businesses in Guam.
Key services
Individual tax e-filing, Business tax e-filing, Vehicle registration renewal, Online payments, Passport office information
Content quality
good
Branding
consistent

Technology

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

Security

Observed score
70/100
Good practices seen
  • HTTPS enabled
  • Secure login form with POST method
  • Use of SSL seal (Thawte)

Analytics and tracking

Services
Google Analytics (via Google Tag Manager)
Tracking level
moderate
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 no blocking or WAF challenges.
  2. Content is comprehensive for Guam tax and government services.
  3. No privacy or cookie consent banners detected.
  4. WHOIS data missing, which is unusual and reduces trust score.
  5. Use of Google Tag Manager for analytics and tracking.
  6. Secure login form present for individual users.
  7. Multiple official Guam government links and logos present.
  8. No social media links found on the site.
  9. No explicit security policies or incident response info published.
Technical notes

Notes

The website is built using standard web technologies such as HTML, CSS, and JavaScript, with Google Tag Manager integrated for analytics. The absence of a detected CMS or advanced frameworks suggests a custom or legacy build. Performance is moderate with no critical errors, but mobile optimization and accessibility are basic and could be improved. The site lacks modern security headers and cookie consent mechanisms, indicating technical debt in security and privacy compliance. Hosting provider details are not discernible from the data. Overall, the technical infrastructure supports the site's functional requirements but would benefit from modernization and enhanced security controls.
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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