IMHO the only possibility might be the complete collapse of the Habsburg empire (which was a possibility during the first semester of 1848).
There are two problems here: Russia, Austria and Prussia were the guarantors of the European order which was established by the Congress of Vienna, and the sudden collapse of one of the two greater powers would open a crisis very difficult to solve peacefully (Prussia was in a way a spare wheel of the triumvirate, and in 1848 their main worry was how to avoid that the revolutionary epidemics might be contained at the borders of Prussia); the other problem is that - for different reasons - the two western powers would not be in a position to intervene directly: France has had its own revolution, a bourgeois one but still a revolution, and while the provisional government would be very cautious and try to avoid giving the rest of Europe the idea that it is 1792 again I cannot see them taking up the role of policeman; the UK policy IOTL was to prop up the Austrian empire, which was considered vital for the stability of Central Europe, but while they would be certainly willing to diplomatically support the Habsburg empire, they would not be in the position of intervening directly nor interested to manage a coalition which might hand over Central Europe to Russia.
The collapse of the Austrian empire would be a very interesting POD, difficult to justify since the various revolutionary movements don't appear to be sensible enough to coordinate their efforts; if it happens, though, everything goes: the future of Europe would be much different from OTL. The least probable course is a Russian intervention, but it is still within the realm of possibilities.