postMessage
An HTML5 cross-document messaging API that allows messages to be passed between windows of different origins. Its security depends on the receiving party validating the source and content of messages.
Timeline (last 90 days)
Cross-window communication relies on mechanisms such as postMessage, and this API does not verify the sender's identity by default, so the receiver must check event.origin and event.source itself, otherwise any window could forge messages.
postMessage is a cross-document communication API introduced in HTML5 that allows messages to be passed between windows of different origins, and its security depends on the receiver validating event.origin and the message content.
In plugin UI-to-host communication scenarios, the two sides often run in different contexts or even different rendering processes, with messages passed through mechanisms such as postMessage, so structural errors are not naturally exposed at coding time.
The advantage of the iframe embedding approach is that styles are completely isolated and will not cause CSS conflicts with the host page, but cross-origin communication requires relying on the postMessage API.
All Facts (4)
Cross-window communication relies on mechanisms such as postMessage, and this API does not verify the sender's identity by default, so the receiver must check event.origin and event.source itself, otherwise any window could forge messages.
50%UnverifiedpostMessage is a cross-document communication API introduced in HTML5 that allows messages to be passed between windows of different origins, and its security depends on the receiver validating event.origin and the message content.
50%UnverifiedIn plugin UI-to-host communication scenarios, the two sides often run in different contexts or even different rendering processes, with messages passed through mechanisms such as postMessage, so structural errors are not naturally exposed at coding time.
50%UnverifiedThe advantage of the iframe embedding approach is that styles are completely isolated and will not cause CSS conflicts with the host page, but cross-origin communication requires relying on the postMessage API.
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