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Security report for flathub.org

Flathub · Technology · United States

Low risk. 2 critical or high findings in GDPR outside view.

Security score

82/100

Risk levelLow

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

Flathub is a prominent app store platform dedicated to Linux users, providing a centralized repository for discovering, installing, and updating Linux applications packaged as Flatpaks. Established in 2016, it serves a global audience of Linux enthusiasts and developers, offering hundreds of apps including popular titles like Firefox, Telegram, and GIMP. The platform emphasizes ease of use and broad compatibility across Linux distributions, positioning itself as the primary app distribution channel in the Linux ecosystem. Technically, Flathub employs modern web technologies including React and Next.js, delivering a fast, responsive, and accessible user experience optimized for both desktop and mobile devices. The site is hosted with reputable providers and uses HTTPS with strong SSL configurations, ensuring secure communications. Analytics are handled via Matomo, reflecting a moderate level of user tracking with some privacy considerations. From a security perspective, Flathub demonstrates good practices such as HTTPS enforcement and domain transfer protection. However, it lacks explicit published privacy, cookie, security, and incident response policies on the main site, which are important for compliance and user trust. The domain registration is consistent and stable, reinforcing the legitimacy of the platform. Overall, Flathub presents a professional, trustworthy, and technically mature platform with room for improvement in privacy compliance and security transparency. Strategic enhancements in these areas would further strengthen user confidence and regulatory adherence.

Scanned

NIS2 and GDPR posture

GDPR outside view
58/ 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

2 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 Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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

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Keep watching flathub.org

This scan found 14 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
100
Security headers
95
Email security
70
DNS health
70
Network security
100
GDPR outside view
58
Average
82

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 flathub.org, from OffSeq Breach.

Total records
52
Employees
0
Customers
52
Third parties
0
Weak passwords
12%

3 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 flathub.org.

Select it in the checkout above.

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

Technical appendix

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

Business context

Business profile

Flathub occupies a unique niche as the leading Linux app store, leveraging the Flatpak packaging format to unify app distribution across diverse Linux distributions. Its business model centers on providing a free, open platform for app developers to publish and users to access software easily. The platform benefits from strong community engagement via forums and GitHub repositories, fostering collaboration and continuous improvement. While revenue streams are not explicit, the platform likely relies on community support and partnerships. Its competitive advantage lies in its broad app catalog, ease of use, and integration with Linux ecosystems. Growth indicators include active app submissions and a growing user base. Partnerships with open source communities and hosting providers enhance its operational stability.

Security posture

Flathub's security posture is solid with HTTPS enforced and domain transfer protections in place. The absence of DNSSEC is a minor gap that could be addressed to enhance DNS security. No vulnerabilities or exposed sensitive data were detected in the analyzed content. However, the lack of publicly available security policies and incident response contacts limits transparency and preparedness perception. The use of Matomo analytics indicates moderate user tracking, which should be balanced with clear privacy disclosures. Overall, Flathub demonstrates a mature security baseline but should publish formal policies and consider implementing security.txt to facilitate vulnerability reporting and incident management.

Recommendations

  1. Publish comprehensive privacy and cookie policies with clear GDPR compliance statements.
  2. Implement and publicly disclose a security policy and incident response plan including contact channels.
  3. Enable DNSSEC for the domain to improve DNS integrity and security.
  4. Add a security.txt file to facilitate vulnerability disclosure and improve security transparency.
  5. Review and enhance security headers explicitly to cover all recommended protections.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Flathub
Description
Find and install hundreds of apps and games for Linux. Enjoy Firefox, Telegram, RetroArch, GIMP and many more!
Key services
App hosting, App distribution, App discovery, App publishing support
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, JavaScript, Matomo Analytics
Frameworks
Next.js
Platforms
Web, Linux
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • No exposed sensitive data in HTML
  • Use of security-focused meta tags

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Matomo
Transparency
basic

Site quality

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

Key observations

  1. Website is a professionally designed Linux app store platform
  2. No privacy or cookie policies explicitly found in HTML content
  3. No contact emails or phone numbers explicitly listed on main page
  4. Use of modern web technologies and frameworks
  5. Good SEO and accessibility practices observed
  6. No signs of malicious or suspicious content
  7. No explicit security or incident response policies published
  8. Matomo analytics used for user tracking
  9. Domain registration is stable and consistent with business
Technical notes

Notes

Flathub's technical infrastructure is modern and robust, utilizing Next.js and React frameworks for a performant and responsive web experience. Hosting and DNS services are provided by reputable vendors, ensuring reliability. The site is optimized for mobile and accessibility, with good SEO practices evident in meta tags and structured data. Analytics are implemented via Matomo, providing privacy-conscious tracking. There is no indication of technical debt or legacy technology. Opportunities exist to further modernize security configurations and enhance privacy compliance mechanisms to align with best practices and regulatory requirements.
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

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