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Security report for stumbleupon.com

StumbleUpon · Technology · N/a

Medium risk. 9 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

63/100

Risk levelMedium

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

StumbleUpon is a technology-driven web content discovery platform that enables users to explore personalized web content through a simple interface branded as 'Stumble!'. The platform integrates with major OAuth providers such as Google, Facebook, Twitter, and Apple to facilitate user login and engagement. The website is built using modern web technologies including React and Next.js, hosted on AWS infrastructure, and employs Google reCAPTCHA Enterprise for bot protection. While the site demonstrates a good level of technical maturity and user experience, it lacks visible privacy and cookie policies, security headers, and explicit contact information, which are important for compliance and trust. The domain registration is consistent with a legitimate business, having been registered since 2001 with a reputable registrar, MarkMonitor Inc.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
35/ 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

9 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 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';…

  2. GDPR outside view

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

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • 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

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

Keep watching stumbleupon.com

This scan found 24 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
77
Security headers
15
Email security
75
DNS health
75
Network security
100
GDPR outside view
35
Average
63

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 stumbleupon.com, from OffSeq Breach.

Total records
54,356
Employees
0
Customers
54,291
Third parties
65
Weak passwords
26%

20 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 stumbleupon.com.

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

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Technical appendix

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

Business context

Business profile

StumbleUpon operates in the technology sector focusing on personalized content discovery and curation. Its business model revolves around user engagement through personalized recommendations and social login integrations. The platform targets general internet users interested in discovering new web content effortlessly. The partnership with Mix.com suggests a strategic alliance to enhance content delivery and user experience. The company appears to be a small-sized entity with a legacy brand presence dating back to 2001. The lack of published business contact details and policies may limit trust and compliance perception among users.

Security posture

The website enforces HTTPS and uses Google reCAPTCHA Enterprise to mitigate automated abuse, indicating a baseline security posture. However, the absence of DNSSEC and security headers such as Content-Security-Policy and X-Frame-Options reduces the overall security robustness. No explicit security policies or incident response contacts are published, which could hinder effective communication during security incidents. The site does not expose sensitive data in the HTML content, and OAuth integrations are implemented securely. Overall, the security posture is moderate but could be improved by adopting additional best practices and transparency.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Implement and configure essential security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Publish comprehensive privacy and cookie policies with clear GDPR compliance statements and consent mechanisms.
  4. Add visible contact information including security incident response contacts (e.g., security@ or abuse@ email addresses).
  5. Conduct regular security audits and vulnerability assessments to identify and remediate potential risks.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
StumbleUpon
Description
StumbleUpon is a web discovery platform that allows users to discover and explore web content personalized to their interests, branded as 'Stumble! For the best of the web, one click at a time'. The site promotes content discovery and personalized web browsing.
Key services
Personalized web content discovery, User account login via Google, Facebook, Twitter, Apple, Mobile app availability for iOS and Android
Content quality
good
Branding
consistent

Technology

Stack
React, Next.js, Google reCAPTCHA Enterprise, Google Tag Manager, Google Identity Services
Frameworks
Next.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA Enterprise for bot protection
  • OAuth login integrations with Google, Facebook, Twitter, Apple

Analytics and tracking

Tracking level
moderate
Privacy practices
poor

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website content is accessible and not blocked by WAF or security challenges.
  2. No privacy, cookie, or terms of service policies found on the homepage or linked pages in provided data.
  3. Multiple OAuth login options indicate user account integration with major providers.
  4. No explicit contact information or security policies published on the site.
  5. Use of modern web technologies and hosting on AWS infrastructure.
  6. No DNSSEC enabled, which is a security improvement opportunity.
  7. No visible security headers detected in the provided HTML content.
  8. No business contact emails or phone numbers found in the HTML content.
  9. No social media links explicitly found in the HTML content.
Technical notes

Notes

The website uses a modern React and Next.js framework stack, leveraging server-side rendering and static asset optimization. Hosting is provided via AWS, inferred from DNS nameservers, ensuring scalable and reliable infrastructure. Google Tag Manager and reCAPTCHA Enterprise are integrated for analytics and security. The site is mobile optimized with good design quality and user experience. However, SEO and accessibility features are basic and could be enhanced. No CMS is detected, suggesting a custom or framework-based solution. Performance is moderate, with deferred loading of scripts and preloading of critical CSS assets.
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. 63/100Medium33 findingsView report
  2. 63/100Medium33 findingsView report
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