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Security report for mathoverflow.net

Stack Exchange · Education · N/a

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

Security score

74/100

Risk levelMedium

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

MathOverflow is a specialized Q&A platform dedicated to professional mathematicians and advanced researchers in mathematics. It operates as part of the Stack Exchange network, leveraging a community-driven model to provide high-quality, research-level mathematical discussions and problem-solving. The platform has a strong market position within the academic and research community, supported by a reputation system and active user moderation. Founded in 2009, it has established itself as a trusted resource for mathematical inquiry. Technically, MathOverflow employs a modern web technology stack including jQuery, MathJax for rendering mathematical notation, and the proprietary Stacks UI framework developed by Stack Exchange. The site is hosted with Cloudflare DNS and CDN services, ensuring fast performance and global availability. The website is mobile-optimized, accessible, and SEO-friendly, providing an excellent user experience. From a security perspective, MathOverflow enforces HTTPS with strong SSL configurations and implements several security headers to protect users. The domain registration is consistent and protected against unauthorized changes. However, there is room for improvement in publishing explicit security policies, incident response procedures, and vulnerability disclosure mechanisms. Privacy compliance is well addressed with clear privacy and cookie policies, including GDPR adherence. Overall, MathOverflow presents a low-risk profile with a mature digital presence, strong community trust, and solid technical infrastructure. Strategic recommendations include enabling DNSSEC, publishing a security.txt file, and enhancing security policy transparency to further strengthen its security posture and user trust.

Scanned

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 mathoverflow.net

This scan found 20 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

€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
52
Security headers
60
Email security
70
DNS health
80
Network security
100
GDPR outside view
83
Average
74

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

MathOverflow serves a niche market of professional mathematicians and researchers, differentiating itself through high-quality, peer-moderated content. Its business model is based on community contributions within the Stack Exchange ecosystem, which provides scalability and network effects. The platform benefits from the reputation and trust of the Stack Exchange brand, enabling it to maintain a loyal user base. Revenue streams are likely indirect, through advertising and Stack Exchange network monetization. The absence of direct contact information suggests a focus on community self-service and automated support. Partnerships within the Stack Exchange network enhance its ecosystem and user engagement.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, strong SSL/TLS configurations, and multiple security headers. The domain status flags prevent unauthorized domain modifications, enhancing domain security. The use of OAuth login via Google adds secure authentication options. However, the lack of a published security policy, incident response contacts, and vulnerability disclosure program indicates gaps in transparency and formal security governance. No vulnerabilities or exposed sensitive data were detected in the HTML content. Privacy policies are comprehensive and GDPR compliant, reflecting good data protection practices. Overall, the security maturity is good but could be improved with formalized policies and disclosure mechanisms.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Publish a security.txt file to provide clear vulnerability disclosure and contact information.
  3. Develop and publish a formal security policy and incident response plan accessible to users.
  4. Enhance Content-Security-Policy headers to reduce risk of cross-site scripting and other attacks.
  5. Increase transparency by providing dedicated security contact channels and periodic security updates.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stack Exchange
Description
Q&A platform for professional mathematicians to ask and answer research-level mathematics questions.
Key services
Mathematics Q&A, Community moderation, Tag-based question categorization, Real-time notifications
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery 3.7.1, MathJax 2.7.5, Stacks UI framework, Google Tag Manager, Cloudflare DNS
Frameworks
Stacks (Stack Exchange UI framework)
Platforms
Stack Exchange network
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • ClientDeleteProhibited domain status
  • Secure cookies
  • OAuth login with Google
  • No exposed sensitive data in HTML

Analytics and tracking

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

Advertising

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 Q&A platform for mathematicians.
  2. Uses modern web technologies and is part of a reputable network.
  3. No direct contact emails or phone numbers found on main site.
  4. Privacy and cookie policies are present and GDPR compliant.
  5. No explicit security policy or incident response info publicly available.
  6. No vulnerability disclosure or security.txt found.
  7. No suspicious or malicious content detected.
  8. Strong branding and consistent user experience.
  9. Uses Google Analytics with privacy settings restricting ad storage.
Technical notes

Notes

MathOverflow is built on a custom Q&A platform leveraging modern JavaScript libraries such as jQuery and MathJax for mathematical rendering. The Stacks UI framework provides a consistent and responsive user interface. Hosting via Cloudflare ensures robust DNS and CDN services, contributing to fast load times and global reach. The site includes accessibility features and SEO optimizations, supporting a broad user base. Analytics are implemented via Google Analytics and Tag Manager with privacy-conscious configurations. The technical infrastructure is well-maintained with no visible technical debt or deprecated technologies. Opportunities exist to further modernize security headers and implement DNSSEC.
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. 78/100Low21 findingsView report
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