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Security report for wsrv.nl

wsrv.nl contributors · Technology · N/a

Medium risk. 6 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

61/100

Risk levelMedium

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

wsrv.nl is an open source image caching and resizing service that enables manipulation of images on-the-fly with a worldwide CDN cache. The service is widely used, processing millions of images per hour and delivering high volumes of outbound traffic. The project is hosted on GitHub and leverages modern technologies such as nginx, libvips, and Cloudflare CDN to ensure fast and reliable performance. The website is well-structured, mobile optimized, and provides clear documentation and links to its open source repositories. Security-wise, the site benefits from HTTPS, DNSSEC, and Cloudflare's protections but lacks explicit security headers and formal security policies. Privacy compliance is partial, with a privacy policy available but no cookie consent mechanism or terms of service. Contact information is not provided, limiting direct communication channels. Overall, wsrv.nl demonstrates a mature technical infrastructure and a strong open source community presence but could improve in formalizing security and privacy practices.

Scanned

This is an earlier scan of wsrv.nl. View the latest report

NIS2 and GDPR posture

GDPR outside view
28/ 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

6 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  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 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';…

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Keep watching wsrv.nl

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.

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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
75
Security headers
40
Email security
55
DNS health
65
Network security
100
GDPR outside view
28
Average
61

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 business operates as an open source project targeting developers and businesses requiring image caching and resizing solutions. Its competitive advantage lies in its high performance, global CDN integration, and free availability under a BSD license. Revenue streams are not explicit, suggesting a community-supported or donation-based model. The target audience is technical users who integrate the service into their applications. The project has a stable market position with significant usage volumes and active GitHub contributions. Partnerships with Cloudflare and use of libvips indicate a robust technology ecosystem. Strategic observations include the need to enhance privacy and security transparency to build further trust and possibly explore monetization or enterprise support offerings.

Security posture

The security posture is solid with HTTPS enforced, DNSSEC enabled, and Cloudflare CDN providing DDoS mitigation and caching. However, the absence of explicit security headers such as Content Security Policy, HSTS, and X-Content-Type-Options reduces the overall security hardening. No vulnerability disclosure or incident response contacts are published, which could delay response to security issues. Privacy compliance is limited, lacking cookie consent mechanisms and detailed data protection policies. No sensitive data exposure or vulnerabilities were detected in the content. The site would benefit from publishing a security policy, implementing security headers, and providing clear incident response channels to improve its security maturity and compliance.

Recommendations

  1. Implement and publish explicit security headers including CSP, HSTS, and X-Content-Type-Options.
  2. Add a cookie policy and consent mechanism to comply with privacy regulations.
  3. Publish a formal security policy and incident response contact information.
  4. Provide clear contact information for users and security researchers.
  5. Consider adding a vulnerability disclosure program or security.txt file.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
wsrv.nl contributors
Description
Image cache & resize service that manipulates images on-the-fly with a worldwide cache.
Key services
Image caching, Image resizing, Fast image processing, Worldwide CDN delivery
Content quality
good
Branding
consistent

Technology

Stack
nginx, libvips, Cloudflare CDN, VitePress, JavaScript ES Modules
Frameworks
VitePress
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • DNSSEC enabled
  • Use of Cloudflare CDN for DDoS protection and caching

Analytics and tracking

Services
Algolia
Tracking level
minimal
Privacy practices
basic

Advertising

Tracking pixels
Algolia
Marketing tools
Algolia search
Transparency
basic

Site quality

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

Key observations

  1. Website is an open source image caching and resizing service.
  2. Content is fully accessible with no blocking or WAF challenges.
  3. No contact emails or phone numbers explicitly provided on the site.
  4. Privacy policy is linked externally on GitHub but no cookie policy or terms of service found.
  5. No forms or data collection fields detected on the homepage.
  6. Uses modern web technologies and frameworks.
  7. No explicit security headers detected in HTML content.
  8. No vulnerability disclosure or security.txt file found.
  9. No advertising or affiliate programs detected beyond Algolia search integration.
  10. No social media links except GitHub.
Technical notes

Notes

The website uses a modern tech stack including VitePress for static site generation, JavaScript ES modules, and integrates with Algolia for search functionality. Hosting is via Cloudflare CDN, ensuring fast global delivery and security benefits. Image processing is powered by libvips and nginx, indicating efficient backend technology. The site is mobile optimized and SEO friendly with proper meta tags and Open Graph data. No CMS beyond VitePress is detected. Performance is fast with preloading of assets and fonts. Accessibility is basic but present with skip links and ARIA labels. Technical risks include lack of security headers and incomplete privacy compliance which could affect trust and regulatory adherence.
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. 61/100Medium35 findingsView report
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