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Security report for stackexchange.com

Stack Exchange Inc · Technology · N/a

Low risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

76/100

Risk levelLow

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

Stack Exchange Inc operates a globally recognized network of community-driven Q&A websites, including the flagship Stack Overflow. Founded in 2009, the company serves a large audience of developers, professionals, and enthusiasts across more than 170 specialized communities. Their business model combines community engagement with advertising and enterprise solutions such as Teams. The website demonstrates excellent content quality, professional design, and clear navigation, supporting a high level of user trust and engagement. Technically, the site leverages modern web technologies including jQuery, SVG icons, and Cloudflare CDN for performance and reliability. The platform is custom-built and optimized for fast loading and mobile responsiveness. Accessibility and SEO practices are well implemented, contributing to a positive user experience. From a security perspective, the site enforces HTTPS and employs domain transfer protections. However, DNSSEC is not enabled, and security headers are not explicitly visible in the provided data. Privacy and cookie policies are comprehensive and GDPR compliant, though no explicit security policy or incident response contacts are published. Overall, the security posture is strong but could be enhanced with additional transparency and DNS security. The domain WHOIS data aligns with the company's public profile, showing a consistent registration history and no privacy protection, which is appropriate for a public technology company. No blocking or WAF challenges were detected, allowing full content access and analysis.

Scanned

This is an earlier scan of stackexchange.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
68/ 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

3 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.

    • 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. 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 stackexchange.com

This scan found 19 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
52
Security headers
60
Email security
85
DNS health
90
Network security
100
GDPR outside view
68
Average
76

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

Stack Exchange holds a leading position in the online Q&A market, distinguished by its extensive network of expert communities. Its competitive advantage lies in its reputation system, community moderation, and breadth of specialized topics. Revenue streams include advertising, enterprise team subscriptions, and talent branding. The target customers range from individual developers to large organizations seeking knowledge sharing and collaboration tools. The company maintains a strong partnership ecosystem with related domains such as Stack Overflow and Meta Stack Exchange. Growth indicators include active user engagement and continuous content updates. Strategic observations highlight the importance of maintaining community trust and expanding enterprise offerings.

Security posture

The website exhibits a mature security posture with mandatory HTTPS, domain transfer lock, and no visible exposure of sensitive data. The absence of DNSSEC and security.txt files suggests room for improvement in DNS and vulnerability disclosure practices. No critical vulnerabilities or malware indicators were found. Privacy policies are robust and GDPR compliant, but incident response mechanisms are not publicly detailed. The platform uses secure login forms with CSRF tokens, indicating attention to secure user authentication. Overall, the security culture appears strong but could benefit from enhanced transparency and DNS security measures.

Recommendations

  1. Enable DNSSEC to strengthen DNS security and prevent spoofing.
  2. Publish a dedicated security policy and incident response contact information.
  3. Implement and report security headers such as Content-Security-Policy and HSTS.
  4. Add a security.txt file to facilitate vulnerability disclosures.
  5. Continue monitoring and updating third-party libraries to avoid vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stack Exchange Inc
Description
We make Stack Overflow and 170+ other community-powered Q&A sites.
Key services
Q&A communities, Community moderation, Reputation and trust system, Enterprise Teams, Advertising
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery 3.7.1, Cloudflare DNS and CDN, SVG icons, Cookie management (jquery.cookie), Responsive CSS
Platforms
Stack Exchange Network
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • No exposed sensitive data in HTML
  • Secure login forms with CSRF tokens (fkey parameter)

Analytics and tracking

Tracking level
moderate
Privacy practices
good

Advertising

Transparency
basic

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 active community questions.
  2. Strong brand presence with consistent logos and design.
  3. No direct contact emails or phone numbers found on the main page; contact likely handled via legal pages or support portals.
  4. Use of modern JavaScript libraries and CDN for performance.
  5. No explicit security policy or incident response info publicly visible.
  6. Privacy and cookie policies are clearly linked and comprehensive.
  7. No signs of suspicious or malicious content.
  8. Multiple Stack Exchange subdomains linked and integrated.
  9. No DNSSEC enabled, which is a minor security gap.
Technical notes

Notes

The website is built on a custom platform utilizing jQuery and modern JavaScript for dynamic content and user interaction. It uses Cloudflare for DNS and CDN services, enhancing performance and availability. The site is mobile optimized and accessible, with clear semantic HTML structure. Performance is fast due to CDN usage and efficient resource loading. There is no indication of legacy or deprecated technologies. Technical risks are minimal but include the lack of DNSSEC and some missing security headers. Opportunities exist to modernize security practices and improve transparency around security policies.
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. 74/100 −7Medium27 findingsView report
  2. 81/100Low20 findingsView report
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