Secure the Unmonitored Frontier: Your Users' Browsers
Your server defenses stop at the firewall. Modern threats like Magecart and supply chain attacks execute directly in the browser — outside your perimeter. Gain total visibility into client-side execution with the W3C Reporting API, routed to your existing security tools.
The Situation
Your Application Runs in an Environment You Don't Monitor
The architecture of the web has changed. To deliver rich, interactive experiences, modern applications rely heavily on client-side code. Research shows that 99% of websites use JavaScript to drive behavior, with the average enterprise site loading over 35 third-party scripts per page.
These scripts — analytics, chatbots, ad trackers, and A/B testing tools — are loaded directly from vendor CDNs into your users' browsers. They execute with the same privileges as your own code, capable of reading input fields, modifying the page, and initiating network requests.
This creates a massive surface of "Implicit Trust." You trust that your vendors are secure, that their code hasn't been tampered with, and that they won't load malicious fourth-party dependencies. Yet, traditional server-side monitoring tools (APM, WAFs) are blind to this activity because the traffic never touches your servers.
The Complication
Attackers Are Exploiting Your Blind Spot
This blind spot is being actively exploited. Magecart (digital skimming) attacks occur once every 16 minutes, injecting malicious code into innocent-looking scripts to steal sensitive data directly from your pages. In 2024 alone, 269 million payment cards were compromised — a 300% increase from the previous year.
Supply chain attacks have reached unprecedented scale. The Polyfill.io incident in June 2024 compromised over 384,000 websites including JSTOR, Intuit, and Mercedes-Benz — all from a single trusted dependency. Your WAF never saw it coming because the attack happened entirely in the browser.
The consequences are severe. British Airways paid £20 million in GDPR fines for a 15-day Magecart attack that exposed 429,612 customers. Beyond fines, breaches erode customer trust — the damage to your brand can far exceed the direct costs.
The Threat Landscape
Attacks Your Server-Side Tools Can't See
Traditional security tools monitor the perimeter. These attacks execute inside it.
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Digital Skimming (Magecart)
- Malicious scripts capture payment data, credentials, and PII directly from form fields. By the time you discover the breach, attackers have been harvesting data for weeks. British Airways paid £20 million in GDPR fines for a 15-day attack.
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Supply Chain Compromise
- When a trusted CDN or package is compromised, every site using it becomes a victim. The Polyfill.io attack affected hundreds of thousands of sites through a single dependency — and your SRI hashes only help if you know when they fail.
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Malicious Script Injection
- XSS attacks and compromised third-party scripts can exfiltrate data, hijack sessions, and redirect users to phishing sites. Your CSP blocks them — but without visibility into violations, you're flying blind.
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Unauthorized API Access
- Third-party scripts can silently request camera, microphone, or geolocation access. Permissions Policy blocks these attempts — but without violation reports, you have no audit trail of what vendors tried to access.
The Solution
Turn the Browser into Your Security Sensor
The W3C Reporting API makes browser security events visible. We capture them and route them to your existing tools.
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Real-Time CSP Monitoring
- Transform CSP from a headache into a weapon. Detect XSS attempts and unauthorized data exfiltration immediately. Our platform filters out noise from browser extensions, giving you high-fidelity alerts on Magecart-style injections.
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Supply Chain Integrity
- Know instantly if a vendor's script changes. By monitoring SRI violations, you can distinguish between a benign update and a malicious supply chain compromise like Polyfill.io.
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Privacy & Data Protection
- Enforce data minimization with Permissions Policy. Receive alerts if third-party scripts attempt to access sensitive APIs like the camera, microphone, or geolocation. Protect user PII at the browser layer.
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Zero Performance Penalty
- No JavaScript SDK. No agents. Just HTTP headers. The browser does the work, sending structured reports asynchronously. Your users never notice a thing.
Integration
Route to Your Existing Security Stack
Your SIEM sees everything — except what happens in the browser. Security teams already manage 6-25 different tools. We don't add another dashboard. We send browser security events directly to the tools you already use.
Whether you use Splunk, Microsoft Sentinel, Elastic Security, or any webhook endpoint, browser reports arrive in your existing workflows. Correlate with server logs. Trigger existing playbooks. Reduce mean time to detect by seeing threats as they happen.
Organizations with integrated security environments detect and contain breaches 79 days faster than those with fragmented tooling. Don't let browser security be another silo.
Report Types
Security Reports Your Server Never Sees
The W3C Reporting API captures multiple security-relevant report types.
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CSP Violations
- Detect XSS attempts and Magecart-style injections when unauthorized scripts try to execute. Learn more
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Integrity (SRI)
- Know when third-party scripts fail hash verification — whether from attack or benign update. Learn more
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Permissions Policy
- Audit when third-party scripts attempt to access camera, microphone, or geolocation. Learn more
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Cross-Origin Isolation
- Deploy COOP/ COEP safely with visibility into what would break. Learn more
Close the Client-Side Blind Spot Today
Start monitoring your browser perimeter in minutes. No agents to install — just standard HTTP headers.