'dangers posed' is correct and usable in written English.
For example: We must consider the dangers posed to the climate by increasing greenhouse gas emissions.
Some objected to the dangers posed by the signs themselves.
Political analysts downplay the dangers posed by Syriza.
So how to deal with the dangers posed by this proliferation of uncertainty and volatility?
He warned of the dangers posed to those "formerly of an unblemished reputation".
Leading groups of scientists and health organisations cannot agree on the dangers posed by saturated fats.
My near-miss, though, left me with a heightened awareness of the dangers posed by bicyclists.
Many civil libertarians have recognized the dangers posed by even minimal political oversight of the press.
Some of the worries about the dangers posed by sovereign funds are overstated.
President Obama is not unaware of the political dangers posed by high unemployment.
Republicans should be acutely aware of the dangers posed by the lobbying community.
He had long warned of the dangers posed by the highly leveraged duo.
