Do muslims worship the kaaba?
No; the Kaaba is only the direction Muslims face in prayer, a focal point of unity, and Muslims worship God alone.
Muslims do not worship the Kaaba or anything inside it. The Kaaba is a small cube-shaped building in the courtyard of the Sacred Mosque in Mecca, and it serves as the qibla, the direction every Muslim faces when praying, wherever in the world they are. God commanded this single direction so that more than a billion worshippers turn the same way, a visible sign of the unity at the heart of the religion. Prayer connects the believer to God; the shared direction connects the believers to one another. Islam teaches that worship is owed to God alone, not to any stone, statue, cross, prophet or saint, and the Kaaba is no exception. The article “One Direction, One People, One God” explains the qibla and its meaning.
Evidence
So from wherever you go out [for prayer, O Muhammad] turn your face toward al-Masjid al-Haram, and indeed, it is the truth from your Lord.
Quran 2:149www.islamreligion.com website موقع دين الإسلام 2013 - 1434 There are more than 1.5 billion Muslims in the world, and each time they pray, they turn their faces in one direction, towards Mecca. The Islamic term for this direction is qibla. When a Muslim prepares to pray, no matter where he is, he turns towards theFrom One Direction, One people, One God — IslamHouse.com. Reproduced with attribution.
Summarised from the cited source · · Scholarly review pending