The stunt follows similar attacks at other UK universities this week.
An arrest has been made – after orange paint was sprayed over the Kings College gatehouse.
A Just Stop Oil activist used a fire extinguisher to cover the neo gothic façade.
It follow similar attacks in Oxford, Birmingham, Exeter and London this week.
Just Stop Oil says it is protesting at universities that have shown “willingness to collaborate” with the government, which it accuses of acts tantamount to “genocide” following decisions to approve a new Rosebank oil and gas field in the North Sea.
The group stated that universities in this country have taken £40-million in fossil fuel funding since 2022, of which Cambridge has received £2.8-million.
The University of Cambridge is the first in the world to take on a science-based target for carbon reduction, committing it to absolute zero before 2050.