---
id: 4929
title: "Introduction to postMessage() Vulnerabilities"
source_domain: yeswehack.com
source_url: "https://www.yeswehack.com/learn-bug-bounty/introduction-postmessage-vulnerabilities"
published_at: "2021-08-25T14:52:00Z"
tags: ["bug-bounty", "browser-security", "web-security", "xss", "javascript", "vulnerability-analysis", "postmessage"]
phying_url: "https://phying.com/item/4929"
lang: en
---

# Introduction to postMessage() Vulnerabilities

## Summary

An introduction to postMessage() vulnerabilities: how cross-origin messaging works, the XSS and data-exposure risks when misconfigured, and how to find and exploit vulnerable message listeners.

## Intelligence Metadata

- **Sources:** yeswehack.com
- **Published:** 2021-08-25T14:52:00Z
- **Original:** https://www.yeswehack.com/learn-bug-bounty/introduction-postmessage-vulnerabilities
- **Phying News:** https://phying.com/item/4929