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Mozilla Foundation Security Advisory 2006-23
Title: File stealing by changing input type
Date: April 13, 2006
Reporter: Claus Jörgensen
Products: Firefox, Mozilla Suite
Fixed in: Firefox 126.96.36.199
Mozilla Suite 1.7.13
Claus Jörgensen reports that a text input box can be pre-filled with a filename and then turned into a file-upload control with the contents intact, allowing a malicious website the ability to steal any local file whose name they can guess.
Jesse Ruderman reports a variation, changing the type of the input control in an event handler to work around some of the initial checks.
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