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Events that occur at the same time for one observer could occur at different times for another. The theory is special in that it only applies in the special case where the curvature of spacetime due to gravity is negligible. In order to include gravity, Einstein formulated general relativity in 1915.
According to General relativity, which is our preferred theory of gravity, gravity is caused by the Stressâenergy tensor, and mass is one of the 16 coefficients in that 4x4 object. I'm not aware that we have any real idea why the stress-energy tensor causes gravity - that's just the way it is.