Skip to main content

Security report for zksync.io

ZKsync · Finance · N/a

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

Security score

72/100

Risk levelMedium

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

ZKsync is an enterprise-focused blockchain technology company specializing in Ethereum-based zero-knowledge rollup solutions. Their platform enables banks, exchanges, and enterprises to leverage scalable, privacy-preserving, and compliant blockchain infrastructure. Positioned as a leading provider in the blockchain finance sector, ZKsync offers products such as Prividium, a private blockchain with built-in compliance, and the ZKsync Stack framework for building new chains. The company emphasizes interoperability, security, and regulatory transparency to support financial institutions and fintechs in adopting digital assets. Technically, ZKsync employs a modern web stack including React and Next.js, ensuring fast performance, mobile optimization, and good accessibility. The website is professionally designed with clear navigation and comprehensive content, reflecting a mature digital presence. Analytics tools like Google Analytics and LinkedIn Insight are used for moderate user tracking, balanced with privacy policies that indicate GDPR compliance. From a security perspective, the site enforces HTTPS and secure form handling but lacks explicit security headers and publicly available incident response or vulnerability disclosure information. The WHOIS data is privacy protected, which is typical for enterprise blockchain firms, and no suspicious patterns were detected. Overall, the security posture is solid but could be improved by adding more transparency and security best practices. The overall risk assessment is low, with a trustworthy and professional online presence supporting a legitimate and enterprise-grade blockchain solution provider. Strategic recommendations include enhancing security headers, publishing incident response details, and implementing cookie consent mechanisms to improve privacy compliance and user trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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"

    • 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 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 zksync.io

This scan found 24 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.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
30
Email security
80
DNS health
80
Network security
100
GDPR outside view
68
Average
72

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

ZKsync operates in the blockchain and finance sectors, targeting banks, exchanges, fintechs, and asset managers. Their competitive advantage lies in providing scalable, privacy-focused, and compliant blockchain infrastructure built on Ethereum. Revenue streams likely include enterprise blockchain deployments, licensing of their ZKsync Stack framework, and ecosystem services such as wallets and interoperability solutions. The company has strong partnerships with reputable financial institutions like Deutsche Bank and Sygnum, enhancing market credibility. Growth indicators include extensive press coverage, research reports, and a broad product suite addressing key industry needs. The partnership ecosystem and developer resources suggest a strategic focus on ecosystem expansion and developer engagement.

Security posture

ZKsync demonstrates a mature security posture with HTTPS enforcement and secure form inputs. However, the absence of explicit security headers such as Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options reduces defense-in-depth. No public security policy or incident response information is available, which limits transparency and preparedness perception. The lack of a vulnerability disclosure program or security.txt file is a gap in responsible disclosure practices. Privacy policies are comprehensive and GDPR compliant, but cookie consent mechanisms are missing, which may affect compliance in some jurisdictions. Overall, the security maturity is good but can be enhanced by adopting additional best practices and transparency measures.

Recommendations

  1. Implement and publish comprehensive security headers including CSP, HSTS, and X-Frame-Options.
  2. Establish and publicly document an incident response plan and vulnerability disclosure program.
  3. Add a cookie consent mechanism to comply with privacy regulations and enhance user trust.
  4. Provide clear contact information for a Data Protection Officer or privacy contact.
  5. Regularly audit and update third-party scripts and tracking tools to minimize privacy risks.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ZKsync
Description
ZKsync helps banks and companies future-proof finance and expand into global digital assets with privacy and compliance. Built on Ethereum, it delivers privacy, scalability, and compliance needed to issue assets, power payments, and launch new financial products.
Key services
ZKsync Prividium - private blockchain with privacy and compliance, ZKsync Stack - ZK rollup framework, ZKsync SSO - ecosystem wallet, ZKsync Airbender - fast prover, Interopability between ZKsync chains
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, JavaScript, Google Tag Manager, LinkedIn Insight Tag
Frameworks
Next.js
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Secure forms with input validation
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, LinkedIn Insight
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
LinkedIn Ads
Tracking pixels
LinkedIn Insight Tag
Marketing tools
LinkedIn Insight
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 professional design.
  2. Strong focus on enterprise blockchain solutions with privacy and compliance.
  3. Multiple reputable partners and press coverage enhance trust.
  4. No direct contact emails or phone numbers publicly listed; contact via forms.
  5. No explicit security policy or incident response info found.
  6. Privacy and cookie policies are present but cookie consent mechanism is missing.
  7. Modern tech stack with React and Next.js used.
  8. Good SEO and accessibility practices observed.
  9. No suspicious or malicious content detected.
Technical notes

Notes

The website is built using modern web technologies including React and Next.js, enabling server-side rendering and optimized performance. The site is mobile responsive with good accessibility features and SEO optimization. Analytics and marketing tools such as Google Tag Manager and LinkedIn Insight are integrated for user tracking and marketing insights. The hosting provider is not explicitly identified, but the site uses HTTPS with a valid SSL certificate. No CMS is detected, indicating a custom or framework-based solution. Performance is fast with preloading of fonts and images. Technical risks are minimal but could include reliance on third-party tracking scripts without explicit user consent.
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

Reviews of this site

Share your experience with zksync.io. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review zksync.io.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.