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Security report for stackoverflow.com

Stack Overflow · Technology · N/a

Low risk. 2 critical or high findings in SSL/TLS.

Security score

78/100

Risk levelLow

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

Stack Overflow is a leading technology community platform founded in 2003, serving professional and enthusiast programmers worldwide. It operates the world’s largest online Q&A community for developers, offering services such as Stack Overflow for Teams, advertising solutions, and knowledge licensing. The platform is enterprise-scale with a consistent and professional brand presence. Technically, the website employs a modern tech stack including jQuery, a proprietary UI framework (Stacks), and cloud-based hosting with Cloudflare DNS. It is optimized for performance, mobile responsiveness, and accessibility. Security posture is strong with HTTPS enforcement, OAuth authentication via trusted providers, and cookie consent mechanisms. However, DNSSEC is not enabled and explicit security policies or incident response contacts are not publicly disclosed. Overall, the domain registration is consistent and trustworthy, supporting the platform’s legitimacy. The site is free from adult or questionable content and maintains good privacy compliance.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
83/ 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

2 findings rated critical or high. Fix these first.

  1. 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 stackoverflow.com

This scan found 18 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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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
52
Security headers
60
Email security
85
DNS health
90
Network security
100
GDPR outside view
83
Average
78

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention stackoverflow.com, from OffSeq Breach.

Total records
101,709
Employees
3
Customers
101,654
Third parties
52
Weak passwords
6%

Latest record dated 2026-05-18 · 24 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for stackoverflow.com.

Select it in the checkout above.

Masked preview

  • –stackoverflow.com2026-05-18
  • –stackoverflow.com2025-07-20
  • –stackoverflow.com2025-07-20

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Stack Overflow holds a dominant market position as the premier Q&A platform for developers, monetizing through advertising, enterprise knowledge solutions, and team collaboration products. Its target audience includes developers, technologists, and enterprises seeking knowledge sharing and recruitment. The business model leverages community-generated content and data licensing. The company benefits from a strong partnership ecosystem including OAuth providers and advertising networks. Growth indicators include continuous feature development and a large active user base. Strategic observations highlight the importance of maintaining security transparency and expanding compliance disclosures to enhance trust.

Security posture

The website demonstrates a mature security posture with HTTPS enforced, clientTransferProhibited domain status, and use of OAuth for secure authentication. Cookie consent is managed via OneTrust, indicating GDPR compliance. No exposed sensitive data or vulnerable libraries were detected in the HTML content. However, the absence of DNSSEC and lack of publicly available security policies or incident response contacts represent areas for improvement. The platform would benefit from publishing a security.txt file and explicit incident response information to facilitate vulnerability reporting and enhance security culture.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security and prevent spoofing.
  2. Publish a security.txt file at the root domain to provide clear vulnerability disclosure channels.
  3. Add a dedicated security policy page detailing frameworks, controls, and incident response procedures.
  4. Provide explicit contact channels for security incidents such as security@ or abuse@ email addresses.
  5. Continue to monitor and update third-party libraries to avoid vulnerabilities and maintain compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stack Overflow
Description
Q&A for professional and enthusiast programmers
Key services
Q&A platform, Stack Overflow for Teams, Advertising, Knowledge Solutions, Labs
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery 3.7.1, Stacks UI framework, Webpack, Cloudflare DNS, Google OAuth, OneTrust cookie consent
Frameworks
Stacks (Stack Overflow's own UI framework)
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • OAuth authentication via Google and GitHub
  • Cookie consent banner implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics (implied)
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google AdSense
Tracking pixels
Google Analytics (implied), OneTrust cookie consent
Marketing tools
Google OAuth, OneTrust
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible and not blocked by WAF.
  2. Comprehensive privacy and cookie policies with consent mechanisms are implemented.
  3. Use of OAuth providers (Google, GitHub) for authentication enhances security.
  4. No direct company contact emails or phone numbers found on the page.
  5. No explicit security policy or incident response contact information found.
  6. Modern tech stack with good performance and mobile optimization.
  7. Advertising and analytics are primarily via Google services with transparency.
  8. No adult or questionable content detected; content is safe for general audiences.
  9. WHOIS data supports legitimacy and long-term operation.
Technical notes

Notes

Stack Overflow’s technical infrastructure is robust, leveraging a custom-built platform with modern JavaScript frameworks and CDN-backed static assets. The use of Webpack and modular JavaScript enhances maintainability and performance. Hosting is supported by Cloudflare DNS, providing resilience and DDoS protection. The site is optimized for mobile devices and accessibility, with proper meta tags and SEO configurations. Performance is fast with deferred script loading and minimal blocking resources. Technical risks include the lack of DNSSEC and potential reliance on third-party scripts for analytics and advertising, which should be regularly audited.
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. 69/100 −9Medium21 findingsView report
  2. 78/100 −3Low26 findingsView report
  3. 81/100Low20 findingsView report
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