According to the automaker water could enter an area near the wiper motor and cause corrosion. This could lead cause the electrical circuit breaker inside the motor to fail, which in turn would cause the wipers to fail leading to the potential of a crash.
Thankfully no injuries have been reported. Dealers will inspect the motors and if there is no corrosion they will install a cover over the motor. If there is corrosion they will replace the motor.
Full Story: MSNBC