The Cupra Formentor shares its active safety technology with the SEAT Leon, tested by Euro NCAP in 2020. Validation tests were performed to ensure that the systems performed similarly and some active safety tests for the Formentor were carried over from the Leon assessment.

The passenger compartment remained stable in the offset frontal test. Protection of the driver's chest was rated as marginal, based on dummy measurements of compression. Dummy measurements indicated good protection of the knees and femurs of both the driver and passenger. Cupra showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions. Analysis of the barrier into which the Formentor crashed showed some localised areas of high deformation and a modest penalty was applied to the score for the risk this represented to the opposing vehicle. In the full-width, rigid wall test, protection was good or adequate for all critical body regions for both the driver and the rear seat passenger. In the side barrier test, representing a collision by another vehicle, protection of all critical body areas was good for all critical body areas. Similarly, in the more severe side pole impact, protection was good and the Formentor scored maximum points in the full-scale side impact tests. In an assessment of protection in farside impact, dummy excursion (its movement towards the other side of the vehicle) was rated as adequate. The Formentor is equipped with a centre airbag to protect against occupant-to-occupant interaction in side impacts. This system worked well in Euro NCAP's test, with good protection of the head for both front seat occupants. Tests on the front seats and head restraints demonstrated good protection against whiplash injury in the event of a rear-end collision. A geometric assessment of the rear seats also indicated good whiplash protection. The car is equipped as standard with a multi-collision braking system, which applies the brakes immediately after an impact to prevent the vehicle from being involved in secondary impacts. The Formentor also has an advanced e-Call system which, in the event of an accident, automatically sends a message to the emergency services, giving the car's location.

In the frontal offset test, protection of all critical parts of the body was good or adequate for both the 6 and 10 year dummies. In the side barrier impact, protection of all critical parts of the body was good for both. The front passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position. Clear information is provided to the driver regarding the status of the airbag and the system was rewarded. The CUPRA Formentor is equipped with an indirect 'child presence detection' system, which issues a warning when it recognises that a child or infant may have been left in the car. Indirect systems are no longer rewarded by Euro NCAP. All of the child restraint types for which the CUPRA Formentor is designed could be properly installed and accommodated in the car.

Protection of the head of a struck pedestrian or cyclist was largely good or adequate, with poor results recorded on the stiff windscreen pillars and at the base and top of the screen. Protection of the pelvis was mostly good, as was that of the femur. Protection of the knee and tibia was good or adequate at all test locations. The autonomous emergency braking system of the CUPRA Formentorresponds to vulnerable road users such as pedestrians and cyclists, as well as to other vehicles. In tests of its response to pedestrians, the system performed adequately but does not detect those to the rear of the car. The system performed well in tests of its reaction to cyclists. Protection against ‘dooring’, where a door is opened into the path of a cyclist approaching from behind, is available as an option but is not included in this assessment. The system’s response to motorcyclists was good.

Overall, the performance of the autonomous emergency braking (AEB) system was good in tests of its reaction to other vehicles. A seatbelt reminder system is fitted as standard to the front and rear seats. The car has an indirect driver status monitoring system as standard, detecting driver fatigue but not distraction. The lane support system gently corrects the vehicle’s path if it is drifting out of lane and also intervenes in some more critical situations. The speed assistance system identifies the local speed limit. The driver can choose to allow the limiter to be set automatically by the system.