There isn't an option to send a notification, but you could configure your policies so that discovering a high vulnerability would be a violation, and you can then fail the build on policy violation. I'm not sure if you want to go that far.
Also, you should take a look at WhiteSource's documentation I believe the "WhiteSource Agent for Bamboo" will be at end of life at the end of this year in favor of their "Unified Agent".
You might want to look at what you need to do to stay up to date. Just a thought.
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