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Security report for arbitrum.io

Offchain Labs · Technology · Iceland

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

71/100

Risk levelMedium

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

Arbitrum is a leading Layer 2 blockchain scaling solution developed by Offchain Labs, designed to enhance Ethereum's scalability and user experience. The platform supports a broad ecosystem of over 900 decentralized applications, including wallets, exchanges, games, and NFT marketplaces, positioning itself as a critical infrastructure player in the blockchain space. The website reflects a mature, professional digital presence with comprehensive developer resources and community engagement channels. Technically, the site leverages modern web technologies such as React and Next.js, hosted with Cloudflare DNS services, ensuring fast performance and mobile optimization. Security posture is strong with HTTPS enforcement, domain transfer protection, and an active bug bounty program, although DNSSEC is not enabled and cookie consent mechanisms are absent, representing minor compliance gaps. Overall, Arbitrum demonstrates a high level of business credibility and technical maturity, with a trustworthy domain registration and active ecosystem partnerships.

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

5 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"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  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 arbitrum.io

This scan found 22 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
35
Email security
85
DNS health
80
Network security
100
GDPR outside view
53
Average
71

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

Technical appendix

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

Business context

Business profile

Arbitrum operates in the blockchain technology sector, focusing on Ethereum Layer 2 scaling solutions. Its business model centers on providing scalable blockchain infrastructure and fostering a developer ecosystem. The company benefits from strong market positioning as a leading Layer 2 solution with significant total value locked and active user base metrics. Revenue streams likely include ecosystem partnerships, developer tools, and possibly transaction fees. The target audience includes blockchain developers, decentralized application users, and crypto investors. The company maintains strategic partnerships with entities like Offchain Labs and the Arbitrum Foundation, enhancing its ecosystem reach. Growth indicators include active social media presence, frequent blog updates, and a robust portfolio of integrated applications. The business exhibits strong operational professionalism and branding consistency.

Security posture

Arbitrum's security maturity is high, with HTTPS enforced and domain transfer protection enabled, reducing risks of domain hijacking. The presence of a bug bounty program via Immunefi indicates proactive vulnerability management. However, the absence of DNSSEC and a security.txt file limits some aspects of security transparency and DNS protection. No exposed sensitive data or vulnerable libraries were detected in the website content. The lack of explicit cookie consent mechanisms may pose GDPR compliance risks. Incident response contact channels are limited to partnership and support emails without dedicated security contacts. Overall, the security posture is robust but could be improved with enhanced DNS security and formalized incident response disclosures.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Publish a security.txt file to provide clear incident response contact information.
  3. Implement an explicit cookie consent banner to improve GDPR compliance and user privacy transparency.
  4. Consider adding dedicated security contact emails (e.g., security@ or abuse@) for incident reporting.
  5. Regularly audit third-party scripts and tracking tools to minimize privacy risks and improve user trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Offchain Labs
Description
Arbitrum is a Layer 2 scaling solution designed to enhance the Ethereum experience by enabling faster, scalable, and seamless blockchain applications. It offers a unified blockchain ecosystem supporting over 900 applications, including wallets, decentralized exchanges, games, and NFT marketplaces.
Key services
Layer 2 Rollup scaling, Blockchain bridging, Developer tools and documentation, Ecosystem support and governance
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Cloudflare DNS, JavaScript, CSS
Frameworks
Next.js, React
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Domain transfer protection enabled
  • Bug bounty program linked

Analytics and tracking

Services
PostHog
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
posthog.com
Marketing tools
PostHog analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed with modern UI and responsive layout.
  2. Strong focus on developer and user ecosystem with multiple portals and bridges.
  3. Active social media presence and community engagement.
  4. No direct contact phone numbers found; contact primarily via email and support forms.
  5. No explicit cookie consent banner detected, which may be a GDPR compliance gap.
  6. Security best practices mostly followed but DNSSEC not enabled.
  7. Bug bounty program linked externally indicating proactive vulnerability management.
  8. Content is safe and suitable for general audiences.
  9. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built using modern web technologies including React and Next.js, ensuring a performant and responsive user experience. Hosting and DNS services are provided by Cloudflare, contributing to fast load times and global availability. The site is well-optimized for mobile devices and accessibility, with clear navigation and structured content. SEO best practices are followed with comprehensive meta tags and Open Graph data. No significant technical debt or outdated libraries were detected. The use of PostHog for analytics indicates moderate user tracking with room for enhanced privacy controls. Overall, the technical infrastructure is solid, supporting the business goals effectively while maintaining good performance and user experience.
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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