Security Vulnerabilities Guide

Understanding and fixing common web security vulnerabilities detected by VitaPulse

Low

Cross-Origin-Embedder-Policy (COEP)

Requires all resources loaded by your page to explicitly opt-in to being loaded cross-origin, enabling full site isolation.

Risk

Without COEP, your site cannot achieve full cross-origin isolation. This means you cannot use powerful APIs like SharedArrayBuffer (needed for WebAssembly threads, high-precision timers). It also leaves your site more vulnerable to Spectre-class side-channel attacks that can read sensitive data from your process memory.

Solution

Set Cross-Origin-Embedder-Policy to 'require-corp'. Ensure all cross-origin resources you load have appropriate CORP or CORS headers. Combined with COOP, this enables full cross-origin isolation.

Example

Cross-Origin-Embedder-Policy: require-corp

MDN - Cross-Origin-Embedder-Policy

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