Always set a complex passphrase within Bitcoin Core. Avoid simple passwords that are susceptible to dictionary or GPU-based cracking .
To prevent your wallet from appearing in an "index of" search results, follow these security best practices: indexofbitcoinwalletdat link
Even without the password, the file may reveal transaction histories and associated public addresses. How to Secure Your Wallet Data Always set a complex passphrase within Bitcoin Core
Even encrypted files are at risk. Attackers use tools to perform Padding Oracle Attacks or brute-force passwords if the encryption was weakened by older software vulnerabilities. How to Secure Your Wallet Data Even encrypted
Web servers often use "directory indexing" to show a list of files if no index page (like index.html ) is present. When users inadvertently upload their Bitcoin Core data directories to a public-facing server or cloud storage like Dropbox, these files become searchable.