If I watch a web page using a web browser, can the web server read what is written in my clipboard?Is it dangerous to copy important information to the clipboard?
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It looks like in older browsers it *may* be possible to get the clipboard contents: https://stackoverflow.com/questions/6413036/get-current-clipboard-content Users shouldn't run insecure browsers though, and doing so is at their own risk. Any browser *should* prompt the user to ask permission for such system access. – David Jul 28 '18 at 11:53
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It all depends what is your definition of secure
. Clipboards used to be a very vulnerable back in the day but since then browsers are much better handling the request for access. Any page requesting access to your clipboard without you actually doing the paste
should prompt the browser to notify you and request for your permission. Here are many examples on the topic
Now some users disable those warnings from the browsers and that could lead to some potential issues.

Akrion
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