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Security report for proton.me

Proton AG · Technology · Switzerland

Low risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

77/100

Risk levelLow

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

Proton AG is a Swiss-based technology company specializing in privacy-focused digital services including encrypted email, calendar, cloud storage, password management, VPN, and secure video conferencing. With over 100 million users globally, Proton positions itself as a leader in privacy by default, leveraging Swiss privacy laws and open source software to build trust and transparency. The company targets privacy-conscious individuals and organizations seeking secure communication and data protection solutions. Technically, Proton employs modern web technologies such as React and Astro, delivering a fast, mobile-optimized, and accessible website experience. Their infrastructure supports multiple platforms including web, mobile, and desktop, reflecting a mature digital presence. Security posture is strong with HTTPS enforcement, multiple security headers, and domain registration protections, although DNSSEC is not enabled, representing a minor area for improvement. Privacy compliance is robust, with clear privacy and cookie policies and GDPR adherence. Business credibility is high, supported by consistent branding, transparent company information, and strong trust signals such as open source code and expert recommendations. Overall, Proton demonstrates a professional, secure, and privacy-respecting online presence.

Scanned

This is an earlier scan of proton.me. View the latest report

NIS2 and GDPR posture

GDPR outside view
53/ 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

4 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

  2. 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

  3. 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

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

Keep watching proton.me

This scan found 17 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
72
Security headers
65
Email security
80
DNS health
90
Network security
100
GDPR outside view
53
Average
77

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 proton.me, from OffSeq Breach.

Total records
900,035
Employees
163,642
Customers
339,245
Third parties
397,148
Weak passwords
8%

Latest record dated 2026-08-26 · 563 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 proton.me.

Select it in the checkout above.

Masked preview

  • –account.proton.me2026-08-26
  • –account.proton.me2026-08-26
  • –account.proton.me2026-08-26
  • –account.proton.me2026-08-26
  • –account.proton.me2026-08-26

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)

Brand lookalikes

Add-on

Domains that imitate proton.me and could be used for phishing or spoofed email, tracked in OffSeq Breach.

Tracked
73
Registered
73
Resolving
73
High or critical
0

Last checked 2026-06-24

Masked preview

  • pr••••.meMediumhomoglyph
  • pe••••.meMediumreplacement
  • pr••••.meMediumreplacement

See the full lookalike list

A one-off add-on that lists up to 20 of the highest-risk lookalikes of proton.me with registration, mail-server, certificate and DNS signals.

Select it in the checkout above.

Lookalike data refreshes continuously. Monitoring on Breach alerts you when a variant is registered, gains a mail server or starts serving HTTPS.

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

Proton operates a freemium business model offering free core services with paid plans for enhanced features. Its market position is strong in the privacy technology sector, competing with other secure communication providers. The company benefits from a broad ecosystem including partner services like Simple Login and Standard Notes, enhancing its value proposition. Proton's revenue streams likely include subscriptions for premium services and business offerings. The target customer segments include privacy-aware consumers, businesses requiring compliance-ready security, and activists or journalists needing confidential communication. Growth indicators include a large user base and continuous product expansion such as Proton Meet and Lumo AI. Strategic partnerships and open source transparency further strengthen its competitive advantage.

Security posture

Proton exhibits a high level of security maturity with enforced HTTPS, comprehensive security headers, and domain registration safeguards. The use of end-to-end encryption across services and open source codebases enhances security transparency. However, the absence of DNSSEC and explicit public incident response or vulnerability disclosure policies indicates areas for enhancement. No vulnerabilities or exposed sensitive data were detected in the website content. Compliance with GDPR is evident, but additional certifications or formal security frameworks are not explicitly stated. Incident response readiness and security culture appear strong but could benefit from more visible documentation. Overall, Proton maintains a robust security posture aligned with its privacy-centric mission.

Recommendations

  1. Enable DNSSEC on the proton.me domain to strengthen DNS security and prevent spoofing.
  2. Publish a clear and accessible vulnerability disclosure policy and incident response plan to improve transparency and community trust.
  3. Consider obtaining and displaying recognized security certifications (e.g., ISO 27001) to enhance credibility.
  4. Enhance contact information by providing dedicated security or abuse contact emails to facilitate incident reporting.
  5. Maintain and expand open source contributions and transparency to reinforce Proton's privacy and security leadership.

Contact details published on the site

Addresses
Legal name
Proton AG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Proton AG
Description
Proton provides easy-to-use encrypted email, calendar, cloud storage, password manager, and VPN services, built on the principle of your data, your rules.
Key services
Proton Mail, Proton Calendar, Proton Drive, Proton Pass, Proton VPN, Proton Authenticator, Proton Meet, Proton Wallet, Lumo AI, Simple Login
Content quality
excellent
Branding
consistent

Technology

Stack
React, Astro, JavaScript, CSS, HTML
Frameworks
Astro
Platforms
Web, Android, iOS, Windows, macOS, Linux
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Domain status includes client/server delete, transfer, update prohibited
  • Open source software for transparency
  • End-to-end encryption for services
  • No trackers or ads on main services

Analytics and tracking

Tracking level
minimal
Privacy practices
excellent

Advertising

Transparency
excellent

Site quality

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

Key observations

  1. Website is professionally designed with clear branding and consistent messaging.
  2. Strong emphasis on privacy and security with multiple encrypted services.
  3. Open source approach enhances transparency and trust.
  4. No signs of malicious or suspicious content.
  5. Comprehensive multilingual support with many localized versions.
  6. No visible contact phone numbers; contact primarily via web forms and email.
  7. No explicit incident response or vulnerability disclosure pages found.
  8. No DNSSEC enabled, which is a minor security improvement opportunity.
Technical notes

Notes

The website uses a modern technology stack including React and Astro frameworks, delivering a performant and responsive user experience. The site is well-optimized for mobile devices and accessibility standards. Hosting and domain registration are managed by reputable providers, with domain status flags preventing unauthorized changes. The site employs multiple preload and preconnect optimizations for performance. No CMS is explicitly detected, suggesting a custom or proprietary content management approach. The technical infrastructure supports a broad platform range, including web, mobile, and desktop applications. Minor technical risks include the lack of DNSSEC and limited visible security certifications, which could be addressed to further reduce risk.
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. 79/100 +1Low24 findingsView report
  2. 78/100Low26 findingsView report
  3. 78/100Low26 findingsView report
  4. 78/100Low23 findingsView report
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