A bug has been discovered in Windows 10 Mobile, which leaves your photos exposed to anyone that picks up your phone. The severity of this obviously depends on what kind of photos you have, but it's definitely something to be aware of.
In fact, it's so easy to take a peek at someone's library that you can test this out for yourself with the following steps:
- Snap a photo while the device is locked.
- Tap the thumbnail of the image that you just took.
- Delete it.
- Press back to return to the Windows Camera app.
- Tap the thumbnail again, which is still the photo that you just took despite deleting it.
- You'll see a black screen; press back to go back to Windows Camera again.
- Now, the thumbnail will be an image from your library. Tap it and you can easily scroll through your photos without ever unlocking the phone.
The good news is that it would appear that this bug is already being fixed. We tested a number of phones for this, and the method didn't work on on any Windows phones that are in the Slow or Fast rings of the Insider Program, so it seems safe to say that this won't be an issue with the Creators Update.
Unfortunately, it works on both the Production ring, as well as the current Release Preview build, which is 14393.726. Luckily, the bug was reported in the Feedback Hub, and it's marked with 'We've got it'.