Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The Kaaba in a dream is the caliph, the Imam, or the leader of the faithful. Entering it indicates security, marriage, and drawing close to the ruler. Whoever sees himself praying on top of the Kaaba is apostatizing from his religion. Whoever sees one of its walls fall, it indicates the death of the caliph.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The Kaaba indicates the mosque, prayer, or following the Sunnah. Whoever sees the Kaaba in his house will gain honor, authority, and live in safety. Whoever steals something from the Kaaba is committing a great sin.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The Kaaba is interpreted as the king or the scholar. Praying inside it is an answered prayer and security from fear. Whoever sees himself performing Tawaf around it is undertaking a religious matter proportional to his circumambulation.