The Cup of Commons is one of the five items you need to complete the world quest called The Millennial Mountains in Genshin Impact.
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Since the quest doesn’t offer any clear explanation on how players can obtain the Cup of Commons? We have many players stuck with this particular section of The Millennial Mountains quest.
So, to help players out, we have prepared a handy guide on where you can get the Cup of Commons in Genshin Impact.
Where to Get Cup of Commons in Genshin Impact

You can get the Cup of Commons from the Treasure Chest that appears when you have completed the world quest called Undetected Infiltration.
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Once you open the Chest that spawns at the end of the quest, you will get awarded the Cup of Commons, one of the key items needed to progress The Millennial Mountains world quest.
How to Get Undetected Infiltration Quest

You can get the Undetected Infiltration world quest by completing another world quest called the Surreptitious Seven-Star Seal Sundering.
During the world quest, Surreptitious Seven-Star Seal Sundering, you come to Glaze Peak to destroy one of the Bedrock Keys, but you find the area full of Treasure Hoarders. Among them are the Milelith posing as Treasure Hoarders.
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When you beat them up, you will trigger the quest Undetected Infiltration.
That’s it for now. Make sure to check out our coverage on the Genshin Impact version 2.6 update.
Genshin Impact is a free-to-play gacha-based role-playing game currently available on PC, PS4, PS5, Android, and iOS.
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Where to Get Cup of Commons in Genshin Impact