Everyone can see stored password
As Ethereum blockchain is public, private variable can still be easily visualised.
Anyone can access contract storage and see stored password using tools like foundry or hardhat, or even on etherscan.
Manual review
Don't use blockchain to store private data.
Or encrypt the password off chain, store encrypted data and make sure you are the only one who know how to decrypt it.
Private functions and state variables are only visible for the contract they are defined in and not in derived contracts. In this case private doesn't mean secret/confidential
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