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Old 30 Nov 2017, 15:29
Dave Dave is offline
Join Date: Jun 2010
There's a lot of ways this can happen, it's impossible for us to tell you what exactly caused it.
Here's a few guesses:
- Outdated vBulletin forum
- Vulnerable plugins
- Other vulnerable software on your server

You need to find the cause first before you can implement something to prevent it from happening again in the future.
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