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Security report for sonder.com

Sonder Holdings Inc. · Hospitality · United States

Low risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

80/100

Risk levelLow

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

Sonder Holdings Inc. operates a technology-driven hospitality platform offering short-term and extended stay accommodations in over 40 cities worldwide. The company differentiates itself by combining boutique apartments and hotels with a mobile app that empowers guests with digital concierge services, keyless entry, and flexible booking options. Their strategic partnership with Marriott Bonvoy enhances their market position by integrating loyalty rewards, appealing to a broad audience including leisure and business travelers. Technically, the website is built on modern frameworks such as Next.js and React, with strong mobile optimization and fast performance. The use of multiple analytics and marketing tools indicates a mature digital marketing strategy. Security posture is robust with HTTPS enforcement, modern security headers, and secure form handling, though there is room for improvement in public security disclosures. Overall, the website presents a professional, trustworthy, and user-friendly experience aligned with industry best practices.

Scanned

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

3 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

  2. 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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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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.

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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
75
Security headers
80
Email security
85
DNS health
85
Network security
100
GDPR outside view
53
Average
80

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 sonder.com, from OffSeq Breach.

Total records
2,097
Employees
20
Customers
1,950
Third parties
127
Weak passwords
8%

Latest record dated 2026-05-31 · 5 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 sonder.com.

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Masked preview

  • –www.sonder.com2026-05-31
  • –sonder.com2026-05-25
  • –www.sonder.com2026-05-18
  • –admin.sonder.com2025-11-02
  • –sonder.com2025-11-01

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)

Technical appendix

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

Business context

Business profile

Sonder is positioned as an important player in the hospitality sector, leveraging technology to disrupt traditional hotel models. Their business model focuses on providing flexible, app-powered stays that cater to diverse customer segments, including solo travelers, families, and corporate groups. Revenue streams likely include nightly and monthly rentals, with additional income from upsells such as parking and pet fees. The Marriott Bonvoy partnership expands their reach and credibility. The company maintains a strong brand presence with consistent messaging and trust signals such as customer testimonials and industry awards. Their global footprint and multi-language support indicate ambitions for continued growth and market penetration.

Security posture

The website demonstrates a mature security posture with HTTPS, comprehensive security headers, and secure handling of user data including CSRF tokens. No exposed sensitive data or vulnerable libraries were detected. However, the absence of a public security.txt file or explicit incident response policies limits transparency for vulnerability reporting. GDPR compliance is indicated through privacy policies and cookie consent mechanisms, but explicit data protection officer contact details are not found. Overall, the security measures are strong but could be enhanced by publishing formal security and incident response documentation.

Recommendations

  1. Publish a security.txt file to facilitate responsible vulnerability disclosure.
  2. Add a dedicated security policy and incident response page to improve transparency.
  3. Include explicit contact information for the Data Protection Officer or privacy team.
  4. Regularly review and update third-party libraries to mitigate potential vulnerabilities.
  5. Enhance user education on privacy and security features within the app and website.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sonder Holdings Inc.
Description
Sonder offers a new way to stay in favorite neighborhoods around the world with exceptional spaces designed for living. It provides apartments and boutique hotels in over 40 cities globally, powered by a mobile app that enables guests to customize their stay and access digital concierge services.
Key services
Short-term apartment rentals, Boutique hotel stays, Mobile app for check-in, mobile key, and concierge, Flexible month-to-month leases, 24/7 digital concierge
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Mapbox, Google Tag Manager, Pinterest tracking, Bing Ads, Segment Analytics
Frameworks
Next.js
Platforms
Web, iOS (App Store), Android (Google Play)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • CSRF tokens present
  • Secure cookie usage
  • No exposed sensitive data in HTML
  • Use of modern security headers

Analytics and tracking

Services
Segment Analytics, Google Analytics (via GTM), Pinterest Analytics, Bing Analytics
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Bing Ads
Tracking pixels
Pinterest, Segment Analytics
Marketing tools
Segment Analytics
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and interactive features.
  2. Strong integration with Marriott Bonvoy loyalty program.
  3. Multiple language and currency options available.
  4. Mobile app presence on iOS and Android confirmed.
  5. Comprehensive privacy and terms policies present.
  6. Contact information including phone and email clearly provided.
  7. Use of modern web technologies and analytics tools.
  8. No signs of WAF or blocking mechanisms.
  9. WHOIS data unavailable, which is unusual but not necessarily suspicious.
Technical notes

Notes

The website is built on a modern React/Next.js stack, leveraging server-side rendering for performance and SEO benefits. Integration with Mapbox and multiple analytics platforms indicates a sophisticated technical infrastructure. The site is well-optimized for mobile devices and accessibility, with responsive design and ARIA attributes. Performance is fast with efficient asset loading and caching strategies. No CMS was explicitly detected, suggesting a custom or headless CMS approach. Hosting provider details are not disclosed. The technical implementation supports a seamless user experience but should maintain vigilance on third-party dependencies and security updates.
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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