postmessage
Safeguard articles tagged "postmessage" — guides, analysis, and best practices for software supply chain and application security.
3 articles
postMessage Has No Default Access Control
Your embeddable widget talks to the page hosting it across origins. Anything that can get a reference to that window can send it a message, and unless the listener checks who sent it, the widget will act on a message from anywhere.
A methodology for testing SPAs for client-side vulnerabilities
DOM XSS, token storage, and API exposure don't show up in a server-side scan — here's a repeatable methodology for testing React, Vue, and Angular apps.
Browser extensions are the softest target in your stack
A patched Grammarly bug let any website steal a user's documents; a 2025 flaw in Anthropic's Claude extension enabled silent prompt injection. Extensions keep failing the same three ways.
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