Such is the case with the latest release of the beta for iOS 13 and iPadOS where according to publication iDeviceHelp, it seems that there is a bug in the software that will allow unauthenticated users to access usernames and passwords stored on the device. However, the “good news” is that this bug seems to be minor and that in order to access the passwords, the handset needs to be unlocked to begin with.
This means that chances of an outsider accessing it would be pretty slim, although it’s still a bug that definitely needs to be fixed. Apple has since been informed of the issue and they have yet to acknowledge it, but hopefully future beta builds of the software should address it. Both iOS 13 and iPadOS are expected to be launched this fall, so there is still time for Apple to get on it.
In the meantime, if you’d rather not deal with the issue, then perhaps it might not be a good idea to keep using the iOS 13 beta, at least until the problem has been dealt with.