The information on the planned attacks, scheduled for spring or summer 2015, was obtained following the interrogation of IS members, according to the anonymous official.
He also stated that the new attacks will not be limited to the Middle East. The United States and the European Union are also on the list of possible targets.
The issue of Islamic State's advance in Syria, Iraq and Libya is a pressing one, especially in the wake of the release of a video on Sunday showing the beheadings of 21 Egyptian Coptic Christians by IS militants.
The video sparked new wave of military action against the group. On Monday, Egyptian and Libyan planes bombed IS positions in Libya.
Egypt is part of the US-led international coalition performing air raids against the IS since August 2014. The coalition was formed following the IS advance in Syria and Iraq, where it has seized large territories.