client-js-audit

Audit client-side JavaScript for DOM XSS by tracing source-to-sink flows from client-controlled sources like location.hash and document.referrer to unsafe DOM update sinks. This process identifies injection vectors in SPA front-ends and embedded widgets, enabling targeted remediation.

Token security risks in SPA front-ends and OAuth-like flows involve unsafe storage patterns using localStorage or sessionStorage and insecure cookies. Identifying these leakage paths allows developers to implement safer token handling practices and prevent unauthorized data access.

Secure postMessage handlers by enforcing strict origin validation and ensuring safe data handling across windows and iframes. This prevents unauthorized cross-origin messaging exploits and protects sensitive client-side data from malicious interference.

Yes, you can apply a client-side security audit to embedded widgets and OAuth-like flows where client-side security is critical. The audit scope specifically covers these contexts to identify DOM XSS risks and token handling flaws unique to these architectures.

Server-side scanning misses DOM XSS and token leakage because it cannot analyze client-controlled sources like location.hash or postMessage handlers. Client-side JavaScript executes in the browser, creating distinct XSS and data-leak risks requiring dedicated source-to-sink analysis.

The best way to find unsafe token storage patterns in JavaScript is to audit client-side code for usage of localStorage, sessionStorage, and insecure cookies. This identifies potential leakage paths and provides actionable remediation guidance for secure token handling.