.env file exposed
If yoursite.com/.env opens in a browser, your passwords and API keys are public. Block it, then change every secret in it.
.git folder exposed
If yoursite.com/.git/HEAD opens, your site's git repository is public. Block dot folders and check what the history contains.
Outdated JavaScript library with known vulnerabilities
Old versions of libraries like jQuery have published security holes. Find the version your pages load and update it.
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