New season, same result.
The reigning Europa League and Champions League winners were level after 90 minutes thanks to first-half goals from Lucas Ocampos and Leon Goretzka, respectively, but the German side broke the deadlock when substitute Javi Martinez headed home in the 104th minute.
The Spaniard's looping header gave Bayern their second UEFA Super Cup win and first since 2013.
The Bavarians have now won 23 straight matches in all competitions going back to last season.
Hansi Flick's side was made to sweat in Budapest, though.
After having a pair of second-half goals called back due to a tight offside call and a foul in the buildup, respectively, Bayern needed veteran shot-stopper Manuel Neuer to save the day at the end of normal time.
With Sevilla's Youssef En-Nesyri clean through on goal in the waning seconds, the 34-year-old German produced a fantastic save, diving down to his right to keep out what almost certainly would have been the winning goal for the Spanish club.
Given a lifeline, Bayern took full advantage in the extra frame when Martinez nodded a rebound over the outstretched arm of Sevilla 'keeper Yassine Bounou.
The Andalusian side fought until the final whistle but was ultimately unable to reply with the goal needed to push the match to penalties.