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Charlton threatened to spoil Cardiff's Championship promotion celebrations on Tuesday night.
A goalless draw secured the Bluebirds' return to the top flight after 51 years.
But in-form Addicks had the better chances and could have returned from Wales with all three points.
Chris Powell's visitors went closest to breaking the deadlock when Johnnie Jackson's (pictured) free-kick hit the woodwork while Ricardo Fuller was denied by a terrific David Marshall save.
Cardiff's Craig Noone had a header ruled out for offside from a Jordan Mutch cross before the final whistle triggered a pitch invasion.
The point leaves Charlton ninth in the Championship with three matches left.