Examples disclosed herein relate to security indicator scores. The examples enable obtaining a security indicator created by a first user where the security indicator may comprise a first observable, and obtaining, from a first source entity, a first sighting of the first observable. The first sighting of the first observable may indicate that the first observable has been observed by the first source entity where the first source entity is associated with a first level of source reliability. The examples enable determining a number of sightings of the first observable. The examples enable determining a first observable score based on the number of sightings of the first observable and the first level of source reliability, and determining an indicator score associated with the security indicator based on the first observable score. The indicator score may be presented to a community of users via a user interface.