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We have a Node.js based web application, that has routes like:

myapp.com/posts/[postId]

We tracked strange requests, which lead to 404 on this routes. The requests were to routes like:

/posts/phpinfo.php
/posts/.user.ini
/posts/info.php3
/posts/phptest.php

Neither we're using PHP nor do i know anything about it...

To me it seems that a crawler/bot is requesting these routes, using some PHP related stuff as postIds which makes no sense (to me)...

Is this legit, though useless, or a security related issue?

What could cause this?

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This is a classic case of an attacker scanning your website to look for any interesting directories or files that may lead to exploitation. I can say that this happens to a very high percentage of websites online.

The hacker is running a not so sophisticated directory scan and is using the .php extension by default.

As mentioned in the comments, this question may be able to give you additional information.

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