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Security report for postcss.org

Technology · Spain

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

Security score

57/100

Risk levelMedium

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

PostCSS.org is the official website for PostCSS, an open source tool that transforms CSS using JavaScript. The site targets web developers and front-end engineers by providing documentation, plugins, and community resources. It is well positioned in the market, trusted by major industry players such as Facebook, GitHub, and Google. The business model is community-driven with sponsorship support. Technically, the site uses modern JavaScript modules and CSS, hosted under a reputable registrar with a stable domain age. The website is fast, mobile-optimized, and accessible with excellent design and navigation. Security posture is moderate; while HTTPS is implied, no explicit security headers or DNSSEC are enabled, and no privacy or cookie policies are published. No contact emails or phone numbers are provided, limiting direct communication channels. Overall, the site is professional and trustworthy but could improve privacy and security transparency.

Scanned

This is an earlier scan of postcss.org. View the latest report

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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 postcss.org

This scan found 28 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

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  • 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
70
Network security
100
GDPR outside view
25
Average
57

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

PostCSS operates as an important entity in the technology sector, focusing on CSS tooling for developers. Its competitive advantage lies in its extensible plugin ecosystem and strong community backing. Revenue streams likely include sponsorships and donations via Open Collective. The target customers are developers and organizations needing CSS processing tools. Growth is supported by endorsements from major tech companies and integration with popular frameworks like Tailwind CSS. Partnerships with companies like Tailwind and ThemeIsle enhance ecosystem reach. The project is mature, founded in 2015, and maintains a consistent brand and content quality.

Security posture

The website demonstrates a moderate security maturity level. The domain is protected against unauthorized transfers, but DNSSEC is not enabled, which is a missed opportunity for DNS security. No security.txt or vulnerability disclosure information is published, limiting transparency for security researchers. The absence of privacy and cookie policies indicates compliance gaps with GDPR and other privacy regulations. No explicit security headers were detected, which could expose the site to common web attacks. Incident response readiness is unclear due to lack of published contacts. Overall, the security posture is functional but could be significantly improved by adopting best practices and transparency measures.

Recommendations

  1. Enable DNSSEC to enhance DNS security and prevent spoofing.
  2. Publish comprehensive privacy and cookie policies to improve GDPR compliance.
  3. Add security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  4. Create and publish a security.txt file with incident response contacts and vulnerability disclosure guidelines.
  5. Provide clear contact information for security and general inquiries to enhance trust and communication.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
PostCSS is a tool for transforming CSS with JavaScript, enabling features such as auto-prefixing, future CSS syntaxes, modules, linting, and more through hundreds of plugins.
Key services
CSS transformation, Autoprefixing, CSS future syntax polyfills, CSS Modules, Linting with stylelint
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, PostCSS plugins, CSS Modules, stylelint
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
70/100
Good practices seen
  • Domain status clientTransferProhibited to prevent unauthorized transfers

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 a professional open source project site for PostCSS
  2. No privacy or cookie policies found on the main page
  3. No contact emails or phone numbers explicitly listed
  4. Strong community and sponsor presence
  5. No forms detected on the homepage
  6. No security.txt or vulnerability disclosure information found
  7. No analytics or tracking scripts detected in the provided HTML
  8. Site uses modern JavaScript modules and CSS assets
  9. No explicit security headers visible in the HTML content
  10. No signs of WAF or content blocking
Technical notes

Notes

The website uses a modern tech stack with JavaScript modules and CSS assets optimized for performance and mobile responsiveness. It is hosted under a reputable registrar with stable DNS configuration but lacks DNSSEC. The site has no visible CMS or third-party analytics, reducing potential privacy concerns. The HTML is valid and well structured with proper meta tags for SEO and social media sharing. No technical debt or legacy technologies were detected. Opportunities exist to improve security headers and implement privacy compliance features. Overall, the technical implementation supports a fast, accessible, and professional user experience.
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. 59/100Medium36 findingsView report
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