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Security report for sublimemerge.com

Sublime HQ Pty Ltd · Technology · Australia

Medium risk. 9 critical or high findings in Email security, Security headers and 2 other checks.

Security score

50/100

Risk levelMedium

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

Sublime Merge is a cross-platform Git client developed by Sublime HQ Pty Ltd, the makers of Sublime Text. The website presents a professional and polished interface targeting developers and software professionals who require a powerful Git GUI client with features like line-by-line staging, commit editing, and syntax highlighting. The product is positioned as a high-performance tool with seamless Git integration across Mac, Windows, and Linux platforms. The website content is rich, well-structured, and consistent with the Sublime brand, indicating a focused business model based on software sales and licensing. Technically, the website employs modern web standards including HTML5, CSS3, JavaScript, and uses JSON-LD structured data to enhance SEO and semantic understanding. The site is responsive and optimized for multiple platforms, providing a fast and smooth user experience. However, there is no evidence of advanced frameworks or CMS usage, suggesting a custom-built or lightweight site architecture. From a security perspective, the site lacks visible security headers and does not provide privacy, cookie, or terms of service policies, which are important for compliance and user trust. The WHOIS data for the domain is missing or indicates the domain may be unregistered or expired, which raises concerns about domain legitimacy despite the professional appearance of the site content. No contact emails or phone numbers are provided, limiting direct communication channels. Overall, the website demonstrates strong business credibility and technical maturity but requires improvements in security posture, privacy compliance, and domain registration transparency to enhance trustworthiness and regulatory adherence.

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

9 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 sublimemerge.com

This scan found 26 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
72
Security headers
15
Email security
60
DNS health
75
Network security
40
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

Sublime HQ Pty Ltd operates in the technology sector, focusing on developer tools with its flagship products Sublime Text and Sublime Merge. The company targets software developers seeking efficient Git clients and text editors. The business model revolves around software licensing and direct sales via their online store. Market positioning is niche but strong within the developer community, leveraging brand recognition from Sublime Text. The company maintains a consistent branding strategy and a small but focused product portfolio. Partnerships appear limited to internal product family sites and official social media channels. Growth indicators include continuous product updates and cross-platform support. The absence of public contact details and privacy policies suggests a need for enhanced customer engagement and compliance transparency.

Security posture

The current security posture of the website is moderate but incomplete. The site uses HTTPS (implied by URL scheme) but lacks visible security headers such as Content Security Policy, HSTS, or X-Frame-Options, which are critical for mitigating common web attacks. No privacy or cookie policies are present, indicating potential GDPR and privacy compliance gaps. The absence of contact information for incident response or security reporting reduces readiness for handling security incidents. No vulnerability disclosures or security.txt files are found, limiting transparency. No exposed sensitive data or vulnerable libraries are detected in the HTML content. Overall, the site would benefit from implementing standard security best practices and compliance documentation to improve its security maturity and user trust.

Recommendations

  1. Implement comprehensive security headers including CSP, HSTS, and X-Frame-Options to enhance protection against web attacks.
  2. Publish clear privacy and cookie policies to comply with GDPR and build user trust.
  3. Provide explicit contact information for support and security incident reporting to improve transparency and responsiveness.
  4. Verify and update domain WHOIS registration to ensure legitimacy and avoid trust issues.
  5. Consider adding a vulnerability disclosure policy or security.txt file to encourage responsible reporting and demonstrate security commitment.

Contact details published on the site

Addresses
Legal name
Sublime HQ Pty Ltd
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sublime HQ Pty Ltd
Description
Discover a powerful Git GUI Client for Mac, Windows and Linux, from the makers of Sublime Text. Line-by-line Staging. Commit Editing. Unmatched Performance.
Key services
Git GUI client for Mac, Windows, Linux, Line-by-line staging, Commit editing, Syntax highlighting, Built-in merge tool, Powerful search, Git command line integration
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, CSS3, JavaScript, Canvas API, Responsive design, JSON-LD structured data
Platforms
Windows, Mac, Linux
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
60/100
Good practices seen
  • No exposed sensitive data in HTML
  • No visible vulnerable libraries

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website is fully accessible with rich content and interactive elements.
  2. No privacy, cookie, or terms of service policies found on main page.
  3. No contact emails or phone numbers explicitly provided.
  4. Strong branding consistent with Sublime HQ Pty Ltd products.
  5. No visible security headers or HTTPS status information available from HTML content.
  6. No analytics or tracking scripts detected in provided HTML.
  7. No forms present on the main page for data collection.
  8. No vulnerability disclosure or security.txt found.
  9. No evidence of advertising or third-party marketing tools.
Technical notes

Notes

The website is built using standard web technologies including HTML5, CSS3, and JavaScript with use of the Canvas API for interactive animations. It employs JSON-LD structured data to improve SEO and semantic clarity. The site is responsive and optimized for desktop and mobile platforms, supporting Windows, Mac, and Linux users. No CMS or third-party frameworks are detected, indicating a custom or minimalistic approach. Performance is fast with no broken elements or errors observed. However, the lack of security headers and privacy compliance features indicates technical debt in security and regulatory areas. The site does not use common analytics or marketing tools, which may limit business intelligence but reduces privacy risks.
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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