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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

78/100

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, VPN, cloud storage, password management, and AI assistant tools. With over 100 million users globally, Proton positions itself as a leader in privacy and security, emphasizing user data ownership and transparency. The company operates a subscription-based freemium business model, targeting privacy-conscious individuals and businesses. Technically, Proton employs modern web technologies such as React and Astro, with a performant, mobile-optimized, and accessible website. Security posture is strong, with HTTPS enforced, domain registration protections, and open-source transparency, though DNSSEC is not enabled and no security.txt file was found. Overall, Proton demonstrates a mature digital infrastructure and a high level of trustworthiness in the privacy technology market.

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

Email alerts on material changes and an exportable JSON history of every change.

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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
70
Email security
80
DNS health
90
Network security
100
GDPR outside view
53
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 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's market position is robust, serving both individual consumers and enterprise clients with a comprehensive suite of privacy tools. Their competitive advantage lies in Swiss jurisdiction privacy laws, open-source software, and a strong community focus. Revenue streams primarily come from paid subscriptions for enhanced features across their services. The company maintains strategic partnerships with related privacy services such as Simple Login and Standard Notes, expanding their ecosystem. Growth indicators include a large user base, positive app ratings, and endorsements from reputable organizations like the United Nations. Proton's operations reflect a commitment to privacy-first principles and sustainable business practices.

Security posture

Proton exhibits a high security maturity level, leveraging end-to-end encryption across its services and enforcing HTTPS on its website. The domain is well-protected with multiple registrar lock statuses, though DNSSEC is not enabled, representing a minor risk. No exposed sensitive data or vulnerable libraries were detected in the website content. However, the absence of a published security.txt and explicit incident response contacts indicates room for improvement in vulnerability disclosure and incident management transparency. Compliance with GDPR is evident through comprehensive privacy and cookie policies. Proton's security culture is reinforced by open-source transparency and community engagement.

Recommendations

  1. Enable DNSSEC to enhance DNS security and prevent spoofing attacks.
  2. Publish a security.txt file to facilitate responsible vulnerability disclosure.
  3. Provide explicit incident response contact information to improve transparency.
  4. Regularly audit and update third-party scripts and dependencies to mitigate vulnerabilities.
  5. Enhance Content-Security-Policy headers to further protect against cross-site scripting and related attacks.

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 VPN, Proton Drive, Proton Calendar, Proton Pass, Proton Wallet, Proton Authenticator, Lumo AI, Simple Login, Standard Notes
Content quality
excellent
Branding
consistent

Technology

Stack
React, Astro framework, JavaScript, CSS, HTML5
Frameworks
Astro, React
Platforms
Web
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
  • No exposed sensitive data in HTML
  • Use of encrypted services
  • Open source transparency

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 and well-structured.
  2. Strong emphasis on privacy and security throughout content.
  3. Multiple privacy-focused products offered under one brand.
  4. Use of modern web technologies and frameworks.
  5. No signs of malicious or suspicious content.
  6. Clear calls to action for account creation and product exploration.
  7. Social media presence is consistent and linked.
  8. No exposed contact phone numbers found; contact primarily via forms and email.
  9. No visible security.txt or explicit incident response contacts.
  10. DNSSEC not enabled, which is a minor security gap.
Technical notes

Notes

The website is built using modern frameworks including Astro and React, ensuring a modular and performant front-end. The use of Strapi CMS is inferred from media URLs, indicating a headless CMS approach. The site is well-optimized for mobile devices and accessibility, with good SEO practices including meta tags and structured data. Hosting and registrar services are professional and consistent with the company's Swiss base. Performance is fast with efficient asset loading and CDN usage for images. Technical risks are minimal, with no critical vulnerabilities detected in the public-facing content.
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 +2Low24 findingsView report
  2. 77/100 −1Low26 findingsView report
  3. 78/100Low26 findingsView report
  4. 78/100Low23 findingsView report
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