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Mozilla Foundation Security Advisory 2007-22
Title: File type confusion due to %00 in name
Announced: July 17, 2007
Reporter: Ronald van den Heetkamp
Fixed in: Firefox 188.8.131.52
Ronald van den Heetkamp reported that a filename URL containing %00 (encoded null) can cause Firefox to interpret the file extension differently than the underlying Windows operating system potentially leading to unsafe actions such as running a program. This is only accessible locally.