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Security report for prebid.org

Prebid.org · Technology · United Kingdom

Medium risk. 4 critical or high findings in Security headers and SSL/TLS.

Security score

73/100

Risk levelMedium

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

Prebid.org is a well-established technology community and open source project focused on programmatic advertising solutions. Founded in 2015, it offers a suite of products including Prebid.js, Prebid Server, and managed services to publishers and ad tech professionals. The website reflects a mature digital presence with comprehensive content, clear navigation, and strong branding consistency. The target audience includes publishers and developers in the programmatic advertising ecosystem. Technically, the site is built on WordPress with modern frameworks and integrates analytics and consent management tools, demonstrating good digital maturity. Security posture is solid with HTTPS enforced and cookie consent mechanisms in place, though some security headers could be improved. The WHOIS data confirms domain legitimacy and transparency, supporting trustworthiness. Overall, the site is professional, secure, and privacy-conscious, serving as a credible resource in its industry.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
100/ 100 · Low
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

4 findings rated critical or high. Fix these first.

  1. 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 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';…

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

Need hands-on remediation? Email guard@offseq.com

Keep watching prebid.org

This scan found 21 issues across 5 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
42
Security headers
30
Email security
85
DNS health
80
Network security
100
GDPR outside view
100
Average
73

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

Prebid.org holds a strong market position as the leading unified auction solution in programmatic advertising. Its open source model and membership community foster collaboration and innovation. Revenue streams likely include membership fees and managed services. The extensive partner ecosystem and event presence indicate active industry engagement. The business model emphasizes transparency and configurability, appealing to a broad range of publishers. Growth indicators include a large number of trusted partners and ongoing product development. Strategic observations suggest continued focus on expanding managed services and enhancing developer engagement.

Security posture

The website demonstrates a mature security posture with HTTPS enabled and clientTransferProhibited domain status. Cookie consent is actively managed via ConsentManager.net, indicating GDPR compliance. However, explicit security policies and incident response contacts are not publicly available, representing a compliance gap. No critical vulnerabilities or exposed sensitive data were detected. Security headers could be enhanced to improve protection against common web attacks. The absence of a vulnerability disclosure program or security.txt file limits transparency in security incident handling. Overall, the security posture is good but could benefit from formalized policies and enhanced header configurations.

Recommendations

  1. Enable DNSSEC to strengthen DNS security and prevent spoofing
  2. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options
  3. Publish a dedicated security policy and incident response contact information on the website
  4. Establish a vulnerability disclosure program or security.txt file to encourage responsible reporting
  5. Continue monitoring and updating third-party libraries to mitigate potential vulnerabilities
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Prebid.org
Description
Prebid drives additional demand from leading ad exchanges straight to your ad server. It is a unified auction solution that is open source and configurable, serving large and small publishers.
Key services
Prebid.js, Prebid Server, Prebid Mobile, SharedID, Managed Services
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, PHP, JavaScript, Google Tag Manager, HubSpot Analytics, ConsentManager.net, FontAwesome, Vimeo embed
Frameworks
Genesis Framework, Mai Engine
Platforms
WordPress
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • Consent management for cookies
  • No exposed sensitive data in HTML

Analytics and tracking

Services
HubSpot Analytics, Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
HubSpot Analytics
Marketing tools
HubSpot, ConsentManager.net
Transparency
good

Site quality

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

Key observations

  1. Website is a professional, well-established technology community site focused on programmatic advertising
  2. Strong presence of privacy and cookie consent mechanisms
  3. No direct contact emails or phone numbers publicly listed, contact via web form
  4. Good SEO and accessibility practices observed
  5. No critical security issues detected
  6. WHOIS data supports legitimacy and transparency
Technical notes

Notes

The website is built on WordPress using the Genesis Framework and Mai Engine, leveraging modern web technologies such as JavaScript, Google Tag Manager, and HubSpot analytics. Performance is moderate with good mobile optimization and accessibility features. The site uses external services for consent management and video embedding, which are integrated with privacy considerations. SEO is well implemented with meta tags, Open Graph, and JSON-LD structured data. Hosting and DNS are managed by reputable providers. Opportunities exist to optimize performance further and enhance security headers. Technical risks are low but should be managed through regular updates and security best practices.
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. 75/100 +7Medium28 findingsView report
  2. 68/100Medium26 findingsView report
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