Intigriti203IN STACK · 2026-01-31 00:00
Exploiting PostMessage vulnerabilities: A complete guide
PostMessage vulnerabilities arise when developers fail to properly validate message origins or sanitize content within cross-origin communication handlers. As modern web applications increasingly rely on the postMessage API for cross-origin communication, whether for embedded widgets, OAuth flows, third-party integrations, or iframe-based components, the attack surface continues to grow. While postMessage enables legitimate data exchange between windows that would otherwise be isolated by the...