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Security report for proton.me

Proton AG · Technology · Switzerland

Low risk. 3 critical or high findings in Security headers and GDPR outside view.

Security score

78/100

Risk levelLow

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

Proton AG is a well-established Swiss technology company specializing in privacy-focused digital services including encrypted email, VPN, calendar, cloud storage, password management, and cryptocurrency wallet solutions. With over 100 million users worldwide, Proton positions itself as a leader in privacy and security, leveraging strong encryption, open-source software, and Swiss privacy laws to protect user data. The company operates a subscription-based freemium business model, offering free accounts with optional paid upgrades for enhanced features. Proton's market position is strengthened by its community-driven approach and endorsements from reputable media and organizations. Technically, the website employs modern frameworks such as Astro and React, supports TLS 1.3, and uses OCSP stapling, though it could improve HTTPS enforcement by enabling HSTS and DNSSEC. Security best practices are observed with no detected vulnerabilities or weak cipher suites. The website is professionally designed, mobile-optimized, and SEO-friendly, providing a high-quality user experience. Overall, Proton demonstrates a strong security posture and business credibility, with transparent policies and community trust. Strategic recommendations include enhancing HTTPS policies and adding explicit cookie consent mechanisms to further improve privacy compliance.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
43/ 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

3 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

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

Keep watching proton.me

This scan found 16 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
92
Security headers
65
Email security
80
DNS health
90
Network security
100
GDPR outside view
43
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 AG operates in the technology sector with a focus on privacy and security services. Its competitive advantage lies in its strong encryption, open-source transparency, and Swiss jurisdiction, which appeals to privacy-conscious users globally. The company generates revenue primarily through subscriptions, targeting individuals and businesses seeking secure communication and data storage solutions. Proton's partnership ecosystem includes related services like Proton VPN and SimpleLogin, enhancing its product suite. Growth indicators include a large user base exceeding 100 million and endorsements from major media outlets. The company maintains a community-first ethos, funded by user subscriptions rather than advertising, which supports its privacy-centric business model. Strategic observations suggest Proton is well-positioned to capitalize on increasing global privacy concerns and regulatory requirements.

Security posture

Proton's security maturity is high, with robust encryption protocols, secure hosting in Switzerland, and adherence to privacy laws. The website uses TLS 1.3 and 1.2 with no vulnerable cipher suites and has OCSP stapling enabled. However, the absence of HSTS and DNSSEC represents areas for improvement. Incident response channels are clearly defined with dedicated abuse and security reporting pages. The company emphasizes open-source software and independent audits, fostering transparency and trust. No critical vulnerabilities or compliance gaps were detected. Proton's security culture is evident in its community engagement and public transparency reports. Overall, Proton maintains a strong security posture aligned with industry best practices.

Recommendations

  1. Enable HTTP Strict Transport Security (HSTS) with includeSubDomains and preload to enforce HTTPS.
  2. Correct and properly configure CAA DNS records to specify authorized certificate authorities.
  3. Implement DNSSEC to enhance DNS security and prevent spoofing.
  4. Add a visible cookie consent mechanism to comply with privacy regulations and improve transparency.
  5. Publish a dedicated security policy document outlining frameworks and certifications.

Contact details published on the site

Addresses
Legal name
Proton AG
Technical notes

Notes

The website is built using modern web technologies including the Astro framework and React for client-side hydration, ensuring a performant and responsive user experience. It supports TLS 1.3 and 1.2 protocols with OCSP stapling for certificate validation. The site uses a CDN for image delivery and employs structured data (JSON-LD) for SEO and rich snippets. Performance is moderate with a load time of approximately 6 seconds and 114 resources loaded. Mobile optimization is excellent, with responsive design and accessibility features in place. No CMS is explicitly detected, suggesting a custom or proprietary content management solution. Hosting appears to be managed by Proton with domain registration through MarkMonitor Inc. Technical risks are minimal, though improvements in DNS security and HTTPS enforcement are recommended to reduce potential attack surfaces.
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. 78/100Low26 findingsView report
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