Take a screenshot using the screenshot tool built into Windows. Memorizes. Crop the image. Save again. The result you’re expecting is most likely an image file that contains only the portion of the image you kept when you cropped it. But in reality, it would be a file that looks like this when opened, but still contains the rest of the image, reports the edge .
The discovery was made by developers Chris Blum and David Buchanan. Chris Blum tried opening a small png file in the screenshot tool and then saving over an existing, larger png file. The resulting file contains the data of both files, with the file data replaced at the end after the symbol representing the end of the image data in the png file. This means that the program that opens the file will only display it in a smaller size, but the rest can still be accessed.
David Buchanan indicated that the error is similar to the “Acropalypse” security vulnerability that was recently discovered in Google’s Pixel phones. He tested with the same tool that was developed to extract the cropped portions of screenshots for Pixel phones, and with only minor changes, made it work with the Windows screenshot tool as well. In addition, others have found that a screenshot from a Pixel phone that was cropped and saved to the Screenshot tool still retains all the original data and can be extracted using the Pixel tool.
The error only applies specifically to the new screenshot tool for Windows 11 and not the old tool with the same name in Windows 10 and earlier system versions. Also, it only applies to images you’ve saved, cropped, and saved again, not just images that were originally part of the screen.
Until Microsoft fixes the security flaw, you can edit screenshots in another program.
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